Remove dependency from RRC gNB structure in NR RLC API

Pass a "type" of RLC operational mode, from which split-type/gNB/UE
decision is derived.

Co-authored-by: Robert Schmidt <robert.schmidt@openairinterface.org>

executables/nr-uesoftmodem.c

@@ -300,7 +300,7 @@ void init_openair0()
 
 static void init_pdcp(int ue_id)
 {
-  if (get_softmodem_params()->nsa && nr_rlc_module_init(0) != 0) {
+  if (get_softmodem_params()->nsa && nr_rlc_module_init(NR_RLC_OP_MODE_UE) != 0) {
     LOG_I(RLC, "Problem at RLC initiation \n");
   }
   nr_pdcp_layer_init();