Add documentation on the OMAP 3 ISP driver. Document the subdevs, V4L2
events and private IOCTLs the driver implements
Signed-off-by: NSakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: NDavid Cohen <dacohen@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>