ASoC: Intel: avs: Add control volume operations

To make introduced peakvol module useful from userspace perspective,
expose ALSA controls allowing DSP volume modification. These provide
even more granular control over volume but are also the only way to
modify volume for devices devoid of codec kcontrols e.g.: DMIC.

Co-authored-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/20221214185500.3896902-3-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>