ASoC: Intel: avs: New volume control operations

ASoC: Intel: avs: New volume control operations

To provide multi-channel - more than 2 - capability to volume controls
implement operations that honor the num_channels of a mixer control. As
mc->num_channels can be 0 and is in fact the default behavior, the new
functions decide between ALL_CHANNELS_MASK and individual channels based
on the field value.

To avoid hard-to-review delta when refactoring the code, first implement
the new behavior with follow up changes cleaning things up.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/20250217102115.3539427-7-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>