soundwire: Suppress errors due to unsupported slave functions

Suppress the errors from the soundwire master runtime suspend
and runtime resume, if the soundwire slave devices does not
implement the functionality, that avoids pm runtime calling
the runtime functions.

Change-Id: I513a37f37e349a0c435295056df8625f284e13e6
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>