[media] coda: add i.MX6 VDOA driver

The i.MX6 Video Data Order Adapter's (VDOA) sole purpose is to convert
from a custom macroblock tiled format produced by the CODA960 decoder
into linear formats that can be used for scanout.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>