[media] v4l: omap4iss: Add description field to iss_format_info structure

The field stores the format description in a human-readable form.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/staging/media/omap4iss/iss_video.c
Simple merge

diff --cc drivers/staging/media/omap4iss/iss_video.h
Simple merge