rfsim: add a T trace to dump RX IQ data

Only for one antenna.

radio/rfsimulator/simulator.c

@@ -1077,6 +1077,10 @@ static int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimest
         *ptimestamp,
         t->nextRxTstamp,
         signal_energy(samplesVoid[0], nsamps));
+
+  /* trace only first antenna */
+  T(T_USRP_RX_ANT0, T_INT(t->nextRxTstamp), T_BUFFER(samplesVoid[0], sampleToByte(nsamps, 1)));
+
   return nsamps;
 }