Remove EdgeX custom Ubuntu 18.04 arm64 file

[eb-oss]

The EdgeX var file for Ubuntu 18.04 arm64 is identical to the common-packer version, other than the base_image. This routes around updates and fixes made in common-packer, making upkeep unnecessarily difficult. The best choice now is to remove the custom file, and only reintroduce it if EdgeX's requirements deviate from common-packer in the future.

Issue: LF-Jira RELENG-2751 Signed-off-by: Eric Ball eball@linuxfoundation.org

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[eb-oss]

For reference, here is the common-packer version of this file: https://github.com/lfit/releng-common-packer/blob/master/vars/ubuntu-18.04-arm64.json

We have been essentially maintaining a copy of that file in this repo. It's the only custom var file we have, and it's not particularly "custom," so I think removing it is the best bet.