ASoC: Intel: avs: Restore stream decoupling on prepare

Revert changes from commit b87b8f43 ("ASoC: Intel: avs: Drop
superfluous stream decoupling") to restore working streaming during S3.

Fixes: b87b8f43 ("ASoC: Intel: avs: Drop superfluous stream decoupling")
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://msgid.link/r/20240405090929.1184068-2-cezary.rojewski@intel.com


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