Reuse get_DRB_RLC_BearerConfig() to get RLC-BearerConfig

For nr_DRB_preconfiguration() and fill_default_secondaryCellGroup(),
there is duplicated code to generate and RLC-BearerConfig, when calling
the existing get_DRB_RLC_BearerConfig() (with the right parameters)
yields a similar configuration (see exceptions below).

Differences:
- We do not support reestablishmentRLC, so we don't set it
- Set prioritisedBitrate to 8kbps instead of infinity (we don't
  prioritize anything, anyway)
- bucketSizeDuration is 50ms instead of 100ms

executables/nr-cuup.c

@@ -84,21 +84,11 @@ int nr_rlc_get_available_tx_space(const rnti_t rntiP, const logical_chan_id_t ch
   return 0;
 }
 
-void nr_rlc_bearer_init(NR_RLC_BearerConfig_t *RLC_BearerConfig, NR_RLC_BearerConfig__servedRadioBearer_PR rb_type)
-{
-  abort();
-}
-
 void rrc_gNB_generate_dedicatedRRCReconfiguration(const protocol_ctxt_t *const ctxt_pP, rrc_gNB_ue_context_t *ue_context_pP, NR_CellGroupConfig_t *cell_groupConfig_from_DU)
 {
   abort();
 }
 
-void nr_rlc_bearer_init_ul_spec(struct NR_LogicalChannelConfig *mac_LogicalChannelConfig)
-{
-  abort();
-}
-
 void nr_rlc_add_drb(int rnti, int drb_id, const NR_RLC_BearerConfig_t *rlc_BearerConfig)
 {
   abort();
@@ -110,11 +100,6 @@ int nr_rrc_gNB_process_GTPV1U_CREATE_TUNNEL_RESP(const protocol_ctxt_t *const ct
   return 0;
 }
 
-void nr_drb_config(struct NR_RLC_Config *rlc_Config, NR_RLC_Config_PR rlc_config_pr)
-{
-  abort();
-}
-
 void prepare_and_send_ue_context_modification_f1(rrc_gNB_ue_context_t *ue_context_p, e1ap_bearer_setup_resp_t *e1ap_resp)
 {
   abort();