[media] v4l: 1 Hz resolution flag for tuners

Add V4L2_TUNER_CAP_1HZ for 1 Hz resolution.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>