media: staging: tegra-vde: De-stage driver

The TODO of tegra-vde driver has been completed, driver now supports
V4L2 stateless video decoding API. Relocate driver to drivers/media.

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