ASoC: SOF: Intel: bdw: Set the mailbox offset directly in bdw_probe

To align with other platforms, set only the sdev->dsp_box.offset in
bdw_probe().
The mailbox offset must be set in order to be able to receive the firmware
ready message.

The offsets and sizes will be re-configured after the FW ready message
based on the window information.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20210915122116.18317-2-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/bdw.c

@@ -535,8 +535,8 @@ static int bdw_probe(struct snd_sof_dev *sdev)
 		return ret;
 	}
 
-	/* set default mailbox */
-	snd_sof_dsp_mailbox_init(sdev, MBOX_OFFSET, MBOX_SIZE, 0, 0);
+	/* set default mailbox offset for FW ready message */
+	sdev->dsp_box.offset = MBOX_OFFSET;
 
 	return ret;
 }