Make USRP tune_offset configurable

UHD documentation: "A tune request instructs the implementation how to
tune the RF chain."

This commit makes this configurable, from nr-softmodem, nr-uesoftmodem,
lte-softmodem, and lte-uesoftmodem.

executables/nr-ru.c

@@ -1049,11 +1049,12 @@ void fill_rf_config(RU_t *ru, char *rf_config_file) {
     cfg->tx_gain[i] = ru->att_tx;
     cfg->rx_gain[i] = ru->max_rxgain-ru->att_rx;
     cfg->configFilename = rf_config_file;
-    LOG_I(PHY, "Channel %d: setting tx_gain offset %f, rx_gain offset %f, tx_freq %lu Hz, rx_freq %lu Hz\n",
+    LOG_I(PHY, "Channel %d: setting tx_gain offset %f, rx_gain offset %f, tx_freq %.0f Hz, rx_freq %.0f Hz, tune_offset %.0f Hz\n",
           i, cfg->tx_gain[i],
           cfg->rx_gain[i],
-          (unsigned long)cfg->tx_freq[i],
-          (unsigned long)cfg->rx_freq[i]);
+          cfg->tx_freq[i],
+          cfg->rx_freq[i],
+          cfg->tune_offset);
   }
 }
 
@@ -2051,6 +2052,8 @@ static void NRRCconfig_RU(void) {
         RC.ru[j]->openair0_cfg.time_source = internal;
       }
 
+      RC.ru[j]->openair0_cfg.tune_offset = get_softmodem_params()->tune_offset;
+
       if (strcmp(*(RUParamList.paramarray[j][RU_LOCAL_RF_IDX].strptr), "yes") == 0) {
         if ( !(config_isparamset(RUParamList.paramarray[j],RU_LOCAL_IF_NAME_IDX)) ) {
           RC.ru[j]->if_south                        = LOCAL_RF;