nrUE NAS: remove mm_counter and sm_counter, replace with nas_count

Specs (24.501, 33.501) don't seem to mention mm_counter and sm_counter,
simply nas_count, let's use this.

openair3/NAS/NR_UE/nr_nas_msg_sim.c

@@ -603,7 +603,7 @@ static void generateSecurityModeComplete(nr_ue_nas_t *nas, as_nas_info_t *initia
   initialNasMsg->length = security_header_len + mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data+security_header_len), size-security_header_len);
 
   stream_cipher.context    = nas->security_container->integrity_context;
-  stream_cipher.count      = nas->security.mm_counter++;
+  stream_cipher.count      = nas->security.nas_count++;
   stream_cipher.bearer     = 1;
   stream_cipher.direction  = 0;
   stream_cipher.message    = (unsigned char *)(initialNasMsg->data + 6);
@@ -703,7 +703,7 @@ static void generateRegistrationComplete(nr_ue_nas_t *nas, as_nas_info_t *initia
   
   initialNasMsg->length = length;
   stream_cipher.context    = nas->security_container->integrity_context;
-  stream_cipher.count      = nas->security.mm_counter++;
+  stream_cipher.count      = nas->security.nas_count++;
   stream_cipher.bearer     = 1;
   stream_cipher.direction  = 0;
   stream_cipher.message    = (unsigned char *)(initialNasMsg->data + 6);
@@ -765,7 +765,7 @@ static void generateDeregistrationRequest(nr_ue_nas_t *nas, as_nas_info_t *initi
 
   nas_stream_cipher_t stream_cipher = {
     .context = nas->security_container->integrity_context,
-    .count = nas->security.mm_counter++,
+    .count = nas->security.nas_count++,
     .bearer = 1,
     .direction = 0,
     .message = (unsigned char *)(initialNasMsg->data + 6),
@@ -855,7 +855,7 @@ static void generatePduSessionEstablishRequest(nr_ue_nas_t *nas, as_nas_info_t *
   initialNasMsg->length = security_header_len + mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data+security_header_len), size-security_header_len);
 
   stream_cipher.context    = nas->security_container->integrity_context;
-  stream_cipher.count      = nas->security.mm_counter++;
+  stream_cipher.count      = nas->security.nas_count++;
   stream_cipher.bearer     = 1;
   stream_cipher.direction  = 0;
   stream_cipher.message    = (unsigned char *)(initialNasMsg->data + 6);

openair3/NAS/NR_UE/nr_nas_msg_sim.h

@@ -92,8 +92,7 @@ typedef struct {
   uint8_t res[16];
   uint8_t rand[16];
   uint8_t kgnb[32];
-  uint32_t mm_counter;
-  uint32_t sm_counter;
+  uint32_t nas_count;
 } ue_sa_security_key_t;
 
 typedef struct {