ASoC: SOF: control: Add access field in struct snd_sof_control

Add a new field to save the access setting for all controls
in struct snd_sof_control. This will be used to ensure that
only widgets belonging to static pipelines have volatile
controls.
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20210927120517.20505-3-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-audio.h

@@ -66,6 +66,7 @@ struct snd_sof_control {
 	int min_volume_step; /* min volume step for volume_table */
 	int max_volume_step; /* max volume step for volume_table */
 	int num_channels;
+	unsigned int access;
 	u32 readback_offset; /* offset to mmapped data if used */
 	struct sof_ipc_ctrl_data *control_data;
 	u32 size;	/* cdata size */

sound/soc/sof/topology.c

@@ -1250,6 +1250,7 @@ static int sof_control_load(struct snd_soc_component *scomp, int index,
 		return -ENOMEM;
 
 	scontrol->scomp = scomp;
+	scontrol->access = kc->access;
 
 	switch (le32_to_cpu(hdr->ops.info)) {
 	case SND_SOC_TPLG_CTL_VOLSW: