Make separate header for nr_pdcp instead of using 4G pdcp

Creates function that have nr_pdcp_ prepended to their name, and change
the signature of some functions for the 5G PDCP:

- nr_pdcp_layer_init()
- nr_pdcp_data_req()
- nr_pdcp_remove_UE()
- nr_pdcp_config_set_security()
- nr_pdcp_remove_UE()
- Make separate functions for nr_pdcp_data_req_srb/drb()

openair2/F1AP/f1ap_cu_rrc_message_transfer.c

@@ -37,7 +37,7 @@
 #include "f1ap_cu_rrc_message_transfer.h"
 #include "common/ran_context.h"
 #include "openair3/UTILS/conversions.h"
-#include "pdcp.h"
+#include "LAYER2/nr_pdcp/nr_pdcp_oai_api.h"
 
 /*
     Initial UL RRC Message Transfer

openair2/F1AP/f1ap_cu_ue_context_management.c

@@ -40,7 +40,7 @@
 #include "rrc_extern.h"
 #include "openair2/RRC/NR/rrc_gNB_NGAP.h"
 #include <openair3/ocp-gtpu/gtp_itf.h>
-#include "pdcp.h"
+#include "LAYER2/nr_pdcp/nr_pdcp_oai_api.h"
 
 static void setQos(F1AP_NonDynamic5QIDescriptor_t *toFill) {
   asn1cCalloc(toFill, tmp);
@@ -958,7 +958,7 @@ int CU_handle_UE_CONTEXT_RELEASE_COMPLETE(instance_t       instance,
     LOG_E(F1AP, "could not find ue_context of UE RNTI %x\n", rnti);
   }
 
-  pdcp_remove_UE(&ctxt);
+  nr_pdcp_remove_UE(ctxt.rntiMaybeUEid);
 
   LOG_I(F1AP, "Received UE CONTEXT RELEASE COMPLETE: Removing CU UE entry for RNTI %x\n", rnti);
   f1ap_remove_ue(CUtype, instance, rnti);