- using NR RACH config common from scc
- fixed return type RA preamble target power functions
- retrieving PRACH format from PRACH resources

- takes in input configuration index and TS 38.211 PRACH tables (6.3.3.2.x)
- using FAPI NR UL config request struct, derived from SCF standard for gNB

modifications for DCI size of format 1_0 for RAR and filling of FAPI for RAR according to special RAR-related configuration

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures

added longer prefix in PRACH symbol zero period for 15/30 kHz SCS. Both gNB and UE processing is modified. prachsim is functional again with new FAPI interfaces.

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures

added handling for N_TA_OFFSET computation and changed some use of FAPI configuration in RU (used ru->config instead of ru->gNB_list[0]->config)

added scheduling of PRACH RX procedures in gNB and RU entities. Initialization of prach sequences added to nr_init.c

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures

Conflicts:
	openair1/PHY/NR_TRANSPORT/nr_transport_proto.h
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

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

Merge branch 'NR_RRC_PRACH_procedures' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_PRACH_procedures