V4L/DVB (9319): v4l2-int-if: Add cropcap, g_crop and s_crop commands.

Signed-off-by: Sameer Venkatraman <sameerv@ti.com>
Signed-off-by: Mohit Jalori <mjalori@ti.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>