The initialisation of the source sub-device is somewhat different as it's
not created by the smiapp driver itself. Remove redundancy in initialising
the two kind of sub-devices.
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: NSebastian Reichel <sre@kernel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>