soundwire: Add support for clock pause and resume

Soundwire master should be kept in clock pause state when
there is no active stream. This will save power when
there is no audio usecase through soundwire interface.
Add support for soundwire clock pause and resume.

Change-Id: If19a866986dcc749850ca2c48553424dfb068bfb
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>