Also fixed bugs in ulsim and dlsim harq tests

This reverts commit 17a1a554.

added FAPI interfaces int gNB prach receiver functions (rx_nr_prach,rx_nr_prach_ru) and in indication to MAC.

- Updated PRACH procedures and general code formatting
- gNB msg1 handling and RAR generation
- general bug fixing
- formatting
- missing headers
- RAR handling.

nr-ip-UL-nos1: Integrate NR MAC PDU structures for the Uplink. Currently supporting only data SDUs, Control Elements to be added.

nr-ip noS1 uplink: Uplink IP traffic successfully received at the IP TUN interface of the gNB now. Logs cleanup.

nr-ip noS1 uplink integration (testing with RFSIMULATOR only): Uplink IP packets received at the gNB and reaching at pdcp layer. Asserion error at pdcp_fifo_flush_sdus when trying to write on the nas socket

Integration PHY and MAC procedures for Timing Advance updates. Compilation and run is OK. TA updates need further fixes as not working as expected.

- "nr_process_timing_advance": TA to be applied is commented out, need to be uncommented
- with introduced delay of 50 in rx_rf, TA update should be 34 in MAC CE
  but this does not occur when ta is applied at UE side according to standard
- introduced ULSCH scheduler and NR RX SDU functions
- fixes to logic in UL fill RX indication
- added crc indication in UL RX
- temporary hardcoded UE_id to 0, rnti not considered in the logic