media: Revert "media: av7110: move to staging/media/deprecated/saa7146"

This reverts commit 3e9ad662e34eb2d42ddef5a2883abd34461dfd9a.

The av7110 is still in use, so it can't be deprecated. Move it back
to staging/media for now.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

media: docs: move DVB audio/video docs to staging

The only upstream driver using the API described there is the
av7110 driver.

As the driver was moved to staging, move the API bits to staging
as well.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>