[media] vivid: set V4L2_CAP_TIMEPERFRAME

The vivid driver didn't set the V4L2_CAP_TIMEPERFRAME flag in s_parm for the
non-webcam inputs. This caused a v4l2-compliance fail.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>