Move RRC config to RRC header, rename

openair2/COMMON/rrc_messages_types.h has mostly 4G types. The only 5G
(gNB) RRC type is gNB_RrcConfigurationReq, which we can move to a header
in the corresponding directory (where it is used).

This allows to separate 5G gNB RRC module from the 4G types in
rrc_messages_types.h in the next commit.

openair2/COMMON/rrc_messages_types.h

@@ -414,17 +414,6 @@ typedef struct NbIoTRrcConfigurationReq_s {
   long                    ue_TimersAndConstants_n311_NB;
 } NbIoTRrcConfigurationReq;
 
-// gNB: GNB_APP -> RRC messages
-typedef struct NRRrcConfigurationReq_s {
-  uint32_t                tac;
-  plmn_id_t plmn[PLMN_LIST_MAX_SIZE];
-  uint8_t                 num_plmn;
-
-  bool um_on_default_drb;
-  bool                    enable_sdap;
-  int                     drbs;
-} gNB_RrcConfigurationReq;
-
 // eNB: realtime -> RRC messages
 typedef struct rrc_subframe_process_s {
   protocol_ctxt_t ctxt;