soc: soundwire: Avoid wakeup after clock pause

Unlock mutex for soundwire bank switch to process the
interrupt before clock pause and request for clock switch
to switch the soundwire clock source.

Change-Id: Idea4306a0e326864431e7cf956044383bf1790db
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>