Add MAX_NUM_NR_UE_INST to NR UE MAC

- Use MAX_NUM_NR_UE_INST in NR UE MAC to control number of MAC instances.
 - Modify the MAC interface slightly so that nr_l2_init_ue only initializes one instance

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -924,8 +924,7 @@ printf("%d\n", slot);
 
   init_nr_ue_transport(UE);
 
-  nr_l2_init_ue(1);
-  UE_mac = get_mac_inst(0);
+  UE_mac = nr_l2_init_ue(0);
   ue_init_config_request(UE_mac, get_slots_per_frame_from_scs(mu));
 
   UE->if_inst = nr_ue_if_module_init(0);

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -780,8 +780,7 @@ int main(int argc, char *argv[])
   init_nr_ue_transport(UE);
 
   //Configure UE
-  nr_l2_init_ue(1);
-  NR_UE_MAC_INST_t* UE_mac = get_mac_inst(0);
+  NR_UE_MAC_INST_t* UE_mac = nr_l2_init_ue(0);
 
   ue_init_config_request(UE_mac, get_slots_per_frame_from_scs(mu));