This reverts commit 29268d0a.

This reverts commit 96554bef

Fix Msg4 segmentation fault when UE_id is invalid and reset ul_failure when UE reconnects using C-RNTI

Our proxy_testscript.py expects these specific log messages to be
logged as LOG_A

- the param was hardcoded to 12 at gNB side
  while it was computed at UE side
- the same function used at UE side has been moved to the common file
- now the computation at gNB side is consistent with the UE

- updating to NR_MAC tag
- minor cleanups
- added more relavant info for debugging purposes

- removed calls to the TDD UL/DL configuration common in FDD mode
- bugfix in the generation of prach info from index
- initial adaptation of gNB schedulers
- adapted PUCCH ack/nack scheduling by taking into account 6 slots min
  delay in FDD mode (to be integrated with latest development of PUCCH)
- made the use of nr_slots_per_frame more consistent