ASoC: amd: acp: store the pdm stream channel mask

Store the pdm stream channel mask, it will be used during system
level resume.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com>
Link: https://lore.kernel.org/r/20230626135515.1252063-9-Syed.SabaKareem@amd.com


Signed-off-by: Mark Brown <broonie@kernel.org>