[media] vivid: add support for single buffer planar formats

Make vivid aware of the difference of planes and buffers. Note that
this does not yet add support for hor/vert downsampled formats.

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