[media] smiapp: Add support for 14 and 16 bits per sample depths

SMIA++ supports 14 and 16 bits per pixel formats as well. Add support to
these formats in the driver.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>