F1AP: minor fixes and preparation for F1 work
- make F1AP logs less verbose
- correctly count Msg.4 DLSCH rounds (avoids CI failure if Msg.4 failure, which leads to one error but no rounds marked in statistics)
- split
rrc_mac_config_req_gNB()into five functions, in preparation of F1AP and to simplify, instead of one function doing multiple things depending on the input parameter (too complex)-
nr_mac_config_scc(): to update the scheduler, once at beginning -
nr_mac_config_mib_sib(): to update the scheduler, once at beginning, will likely disappear in the future -
nr_mac_add_ue(): to add a new UE in SA -
nr_mac_update_cellgroup(): to update an existing UE's cellGroup -
nr_mac_add_nsa_ue(): add a UE in NSA
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