media: Clean stateless control includes

Avoid including h264-ctrls.h, vp8-ctrls.h, etc,
and instead just include v4l2-ctrls.h which does the right
thing.

This is in preparation for moving the stateless controls
out of staging, which will mean removing some of these headers.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Tested-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>