NR UE FAPI: provide ntn_config as part of phy_config.config_req instead of a dedicated scheduled_response dl_config PDU

We need the ntn_config when reconfiguring the PHY layer for a new initial sync,
e.g. for calculating the DL Doppler frequency.

As a dedicated scheduled_response dl_config PDU it reaches the PHY layer too late,
as part of the phy_config.config_req it reaches the PHY layer in time with the
other configuration values.

openair1/PHY/INIT/nr_init_ue.c

@@ -338,8 +338,6 @@ void term_nr_ue_signal(PHY_VARS_NR_UE *ue, int nb_connected_gNB)
     free_and_zero(ue->prs_vars[idx]);
   }
 
-  free_and_zero(ue->ntn_config_message);
-  
   sl_ue_free(ue);
 }