soundwire: amd: add pm_prepare callback and pm ops support

Add pm_prepare callback and System level pm ops support for
AMD SoundWire manager driver.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Signed-off-by: Mastan Katragadda <Mastan.Katragadda@amd.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/lkml/20230310162554.699766-9-Vijendar.Mukunda@amd.com
Link: https://lore.kernel.org/r/20230321050901.115439-9-Vijendar.Mukunda@amd.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>