Add config options for eupf ebpf-program

[pirog-spb]

At the moment the only way to configure ebpf befaviour is build options. There are several cases where start time configuration is more suitable:

• local N3 ip address (is configured via FAR map currently)
• ?

Investigate possibility to use rodata section to setup startup configuration parameters. See bpf_config config in https://github.com/xdp-project/bpf-examples/blob/master/pping/pping_kern.c

[pirog-spb]

Yet another hint https://stackoverflow.com/questions/70475993/how-to-let-user-space-to-populate-an-ebpf-global-data-at-load-time