bugfix: put constants in correct file

The RLC tests were not compiling because of the include of

    openair2/RRC/NR/rrc_gNB_radio_bearers.h

by

    openair2/LAYER2/nr_rlc/nr_rlc_entity.h

which does not seem correct/necessary to start with.

The only thing needed by nr_rlc_entity.h from rrc_gNB_radio_bearers.h
is MAX_DRBS_PER_UE which can be defined in common/platform_constants.h
like NGAP_MAX_PDU_SESSION.

openair2/LAYER2/nr_rlc/nr_rlc_entity.h

@@ -23,7 +23,6 @@
 #define _NR_RLC_ENTITY_H_
 
 #include <stdint.h>
-#include "openair2/RRC/NR/rrc_gNB_radio_bearers.h"
 
 #include "common/utils/time_stat.h"
 

openair2/LAYER2/nr_rlc/nr_rlc_ue_manager.h

@@ -23,6 +23,7 @@
 #define _NR_RLC_UE_MANAGER_H_
 #include "openair2/COMMON/platform_types.h"
 #include "nr_rlc_entity.h"
+#include "common/platform_constants.h"
 
 typedef void nr_rlc_ue_manager_t;