soundwire: Remove pm runtime sync during soundwire read and write

sync to pm runtime increments the count and calls soundwire runtime
resume function. This is not needed for every soundwire register read
and write operation. Change removes syncing to pm runtime during
soundwire register read and write operations.

Change-Id: Id75dae4fb9d5a1785c3829541dbca9a3c4b4698f
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>