NFAPI RACH now working.  Gets sent to VNF.  VNF cores currently on receipt.  Probably fixed by merge from main RU-RAU-split which I will do next

Network search working again.  Now calling generate_dci_top every subframe, using dummy subframe if no data to transmit. MIB and SIB2/3 coming out.  UE sees cell

L1/L2 scheduling extensions for BL/CE operation, BR random-access procedure, BR PRACH detection. Still untested, but compilation succeeds. Missing elements in L2 - PUSCH programming for Msg3, Msg4 retransmission programming for BL/CE. DLSCH/ULSCH programming for UE-specific DLSCH/ULSCH for BL/CE

Note: this commit is work in progress. Contains initial integration of NFAPI data structures which are tested for TX path. RX path to follow.