There are few variations of 4k resolutions. The biggest one is
4096x2304 which is also supported by HW. It has also nice property that
both width and size are divisible by maximum HEVC CTB size, which is 64.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>