add two units min_volume_step and max_volume_step to the snd_sof_control
struct, for the min and max step of the volume_table.
Signed-off-by: NZhu Yingjiang <yingjiang.zhu@linux.intel.com>
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NMark Brown <broonie@kernel.org>