drivers/sx126x: fix compilation for sx126x_dio3

Author: fabian18

drivers/sx126x/sx126x.c

@@ -394,9 +394,8 @@ int sx126x_init(sx126x_t *dev)
 #endif
 #if IS_USED(MODULE_SX126X_DIO3)
      if (dev->params->dio3_mode == SX126X_DIO3_TCXO) {
-        sx126x_set_dio3_as_tcxo_ctrl(dev, dev->params->u_dio3_arg.tcxo_volt,
-                                     dev->params->u_dio3_arg.tcx0_timeout);
-
+        sx126x_set_dio3_as_tcxo_ctrl(dev, dev->params->dio3_arg.tcxo_volt,
+                                     dev->params->dio3_arg.tcxo_timeout);
         /* Once the command SetDIO3AsTCXOCtrl(...) is sent to the device,
            the register controlling the internal cap on XTA will be automatically
            changed to 0x2F (33.4 pF) to filter any spurious injection which could occur