move common code file in common directory

remove several unused files
remove mem_block_t that is never used in a different way than a simple heap buffer
move up IP address type and remove duplications of the same struct declaration

openair2/LAYER2/MAC/config.c

@@ -28,7 +28,7 @@
  * @ingroup _mac
  */
 
-#include "COMMON/platform_types.h"
+#include "common/platform_types.h"
 #include "common/platform_constants.h"
 #include "LTE_SystemInformationBlockType2.h"
 //#include "RadioResourceConfigCommonSIB.h"

openair2/LAYER2/MAC/config_ue.c

@@ -31,8 +31,7 @@
 
  */
 
-
-#include "COMMON/platform_types.h"
+#include "common/platform_types.h"
 #include "common/platform_constants.h"
 #include "nfapi/oai_integration/vendor_ext.h"
 #include "SCHED_UE/sched_UE.h"

openair2/LAYER2/MAC/eNB_scheduler_RA.c

@@ -33,7 +33,7 @@
 
 
 #include "assertions.h"
-#include "platform_types.h"
+#include "common/platform_types.h"
 
 #include "LAYER2/MAC/mac.h"
 #include "LAYER2/MAC/mac_extern.h"

openair2/LAYER2/MAC/proto_NB_IoT.h

@@ -32,7 +32,7 @@
 
 #include "openair1/PHY/LTE_TRANSPORT/defs_NB_IoT.h"
 #include "LAYER2/MAC/defs_NB_IoT.h"
-#include "COMMON/platform_types.h"
+#include "common/platform_types.h"
 #include "openair2/RRC/LTE/defs_NB_IoT.h"
 /** \addtogroup _mac
  *  @{