The driver creates two subdevs, one for the image sensor pixel array
(and the related readout logic) and one for an ISP.

The first subdev already uses the MEDIA_ENT_T_V4L2_SUBDEV_SENSOR type,
but the second subdev isn't a sensor pixel array.

So, rename the second subdev as MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>