Changed NR_UE_CAPABILITY_SLOT_RX_TO_TX to 3

Tested with X300 and there was no real-time problems.
Could get the same throughput as when NR_UE_CAPABILITY_SLOT_RX_TO_TX is 4.

openair1/PHY/impl_defs_top.h

@@ -270,7 +270,7 @@
 /* FFS_NR_TODO it defines ue capability which is the number of slots     */
 /* - between reception of pdsch and tarnsmission of its acknowlegment    */
 /* - between reception of un uplink grant and its related transmission   */
-#define NR_UE_CAPABILITY_SLOT_RX_TO_TX           (4)
+#define NR_UE_CAPABILITY_SLOT_RX_TO_TX           (3)
 
 #ifndef NO_RAT_NR
   #define DURATION_RX_TO_TX           (NR_UE_CAPABILITY_SLOT_RX_TO_TX)  /* for NR this will certainly depends to such UE capability which is not yet defined */