1. Added guard for exceeding DRB creation in ASN1 & RRC
2. Created function for finding the next available drb

Note: tested with 2 UEs in RFSIM mode

Multiple DRBs - Fix MR Conflicts: 1. RLC - Removed mispositioned conditional. 2. RRC - Replaced arguements in generateDRB func & use bool. 3. RRC - Removed the MAX_DRB_PDUSESSION definition. 4. SDAP - Replaced boolean_t with bool. 5. RRC - Fixed indentation in SDAP Configuration. 6. RRC - Changed var nb_drb_to_setup to 1.

integration_2022_wk39

See merge request oai/openairinterface5g!1730

MR !1653 NR removing semi_static structures
MR !1690 Fix PDCCH when BWPStart is higher than 0
MR !1706 AMF and NGU mode config cleanup
MR !1721 Moving targets/ARCH to sdr/
MR !1724 Updated README for l2-sim, rf-sim
MR !1725 min_rxtxtime=6 added to docs when building the RFSimulator UE
MR !1729 fix(doc): healthchecks are now embedded in CN5G images