changed so USRP also uses the piece of codes EXMIMO is uing in setting TA=624 when it is TDD

(cherry picked from commit a75dbc4156ed4e216145f1deb81c6e04c1cddf02)

targets/RT/USER/lte-softmodem.c

@@ -3163,7 +3163,7 @@ int main( int argc, char **argv )
       UE[CC_id]->tx_power_max_dBm = tx_max_power[CC_id];
 
 
-#ifdef EXMIMO
+#if defined(EXMIMO) || defined(OAI_USRP) // 2016-04-27 wilson also set TDD N_TA_offset with USRP
       //N_TA_offset
       if (UE[CC_id]->lte_frame_parms.frame_type == TDD) {
         if (UE[CC_id]->lte_frame_parms.N_RB_DL == 100)