Allwinner A83T contains rotation core which can rotate and flip images.

Add a driver for it.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
[hverkuil-cisco@xs4all.nl: MAINTAINERS paths were out of date, fix that]
[hverkuil-cisco@xs4all.nl: VFL_TYPE_GRABBER -> _VIDEO]
[hverkuil-cisco@xs4all.nl: Fix module build]
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>