Add configuration for phase compensation

For 7.2 FH, some RUs do phase compensation, whereas for others, the DU
does it. In fact, this can be "negotiated" using the M plane. Since we
don't have the M plane yet, add a configuration option to set where
phase compensation is performed.

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -610,6 +610,7 @@ int main(int argc, char **argv)
   gNB = RC.gNB[0];
   gNB->ofdm_offset_divisor = UINT_MAX;
   gNB->ldpc_offload_flag = ldpc_offload_flag;
+  gNB->phase_comp = true; // we need to perform phase compensation, otherwise everything will fail
   frame_parms = &gNB->frame_parms; //to be initialized I suppose (maybe not necessary for PBCH)
   frame_parms->nb_antennas_tx = n_tx;
   frame_parms->nb_antennas_rx = n_rx;