Episys/andrew/debugging rach+fixing rx unpack

See merge request aburger/openairinterface5g!4

The printfs were mangling the log.

Use LOG_A for log messages intended for analysis

See merge request aburger/openairinterface5g!2

This change allows us to disable the LOG_I messages to reduce
overhead.

Removed LOG_VAR macro because it was used in only one place, and
a better solution is to simply use `__attribute__((unused))`.