[iccpd] Do not set env platform

[globaltrouble]

Description

mclagsyncd source is in sonic-swss repo, its binary is inside iccpd container and binary use platform env variable https://github.com/Azure/sonic-swss/blob/ef6b5d48297f7f19a8ec57e2d7b997fd0919bb9d/mclagsyncd/mclaglink.cpp#L191

But platform env is set only inside swss container services, for example https://github.com/Azure/sonic-buildimage/blob/7d40384c58848c368ecf7b2c520f7a17fcbc8bdb/dockers/docker-orchagent/orchagent.sh#L7

ICCPD container contains mclagsyncd daemon, but do not set platform env variable.

Steps to reproduce the issue:

1. setup MC_LAG topology (for example on platform broadcom)
2. wait for MCLAG bring up,
3. check port isolation group

Describe the results you received:

Env variable do not set inside the iccpd container, code can't use it.

Describe the results you expected:

Env variable is set, inside the iccpd container, code can use it.

Output of show version:

admin@sonic:~$ show version

SONiC Software Version: SONiC.hotfix_fix-iccpd-env.0-dirty-20211012.033913
Distribution: Debian 10.11
Kernel: 4.19.0-12-2-amd64
Build commit: 0d202fa9e
Build date: Tue Oct 12 10:45:17 UTC 2021
Built by: user@igk-ct5-server

Platform: x86_64-bfn_tna_model
HwSKU: model
ASIC: barefoot
ASIC Count: 1
Serial Number: N/A
Model Number: N/A
Hardware Revision: N/A
Uptime: 17:30:17 up 18 days,  6:50,  1 user,  load average: 2.12, 2.15, 2.22

Docker images:
REPOSITORY                    TAG                                            IMAGE ID            SIZE
docker-snmp                   hotfix_fix-iccpd-env.0-dirty-20211012.033913   4b858ec17e74        456MB
docker-snmp                   latest                                         4b858ec17e74        456MB
docker-platform-monitor       hotfix_fix-iccpd-env.0-dirty-20211012.033913   fd1e44ac7323        632MB
docker-platform-monitor       latest                                         fd1e44ac7323        632MB
docker-dhcp-relay             latest                                         40badaaee0cc        427MB
docker-syncd-bfn              hotfix_fix-iccpd-env.0-dirty-20211012.033913   414a7127f5cb        1.1GB
docker-syncd-bfn              latest                                         414a7127f5cb        1.1GB
docker-sflow                  hotfix_fix-iccpd-env.0-dirty-20211012.033913   7f00ae2a55e5        427MB
docker-sflow                  latest                                         7f00ae2a55e5        427MB
docker-teamd                  hotfix_fix-iccpd-env.0-dirty-20211012.033913   3e8c89f1af01        426MB
docker-teamd                  latest                                         3e8c89f1af01        426MB
docker-lldp                   hotfix_fix-iccpd-env.0-dirty-20211012.033913   ac3d82923936        454MB
docker-lldp                   latest                                         ac3d82923936        454MB
docker-nat                    hotfix_fix-iccpd-env.0-dirty-20211012.033913   0b4df296a868        429MB
docker-nat                    latest                                         0b4df296a868        429MB
docker-database               hotfix_fix-iccpd-env.0-dirty-20211012.033913   7657102f3967        414MB
docker-database               latest                                         7657102f3967        414MB
docker-iccpd                  hotfix_fix-iccpd-env.0-dirty-20211012.033913   f0474b215b50        426MB
docker-iccpd                  latest                                         f0474b215b50        426MB
docker-router-advertiser      hotfix_fix-iccpd-env.0-dirty-20211012.033913   34dbaf8923ea        414MB
docker-router-advertiser      latest                                         34dbaf8923ea        414MB
docker-fpm-frr                hotfix_fix-iccpd-env.0-dirty-20211012.033913   760808468236        444MB
docker-fpm-frr                latest                                         760808468236        444MB
docker-sonic-mgmt-framework   hotfix_fix-iccpd-env.0-dirty-20211012.033913   d23263c286d1        569MB
docker-sonic-mgmt-framework   latest                                         d23263c286d1        569MB
docker-orchagent              hotfix_fix-iccpd-env.0-dirty-20211012.033913   ddb2fd8bbb39        444MB
docker-orchagent              latest                                         ddb2fd8bbb39        444MB
docker-sonic-telemetry        hotfix_fix-iccpd-env.0-dirty-20211012.033913   a056e355488c        502MB
docker-sonic-telemetry        latest                                         a056e355488c        502MB
docker-macsec                 hotfix_fix-iccpd-env.0-dirty-20211012.033913   afc942b660dc        429MB
docker-macsec                 latest                                         afc942b660dc        429MB

Additional information you deem important (e.g. issue happens only occasionally):

PR to fix it https://github.com/Azure/sonic-buildimage/pull/8945

[bratashX]

PR to fix this problem was successfully merged. @zhangyanzhao Could you please close the issue??