media: coda: round up decoded buffer size for all codecs

The BIT decoders always write 16x16 macroblocks. Align stride and height to
avoid spilling luma data into the top of the chroma planes.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>