[media] media: venus: venc: add video encoder files

This adds encoder part of the driver plus encoder controls.

Signed-off-by: Stanimir Varbanov <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

Author: Stanimir Varbanov