media: Revert "media: saa7146: deprecate hexium_gemini/orion, mxb and ttpci"

This reverts commit e33fdb5a02490059e2f48ced2c038c8a46c6476d.

The saa7146-based devices are still in use, esp. for DVB. So move
these drivers back to mainline.

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

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[media] saa7146: Move it to its own directory

In order to better organize the directory tree, move the
saa7146 common driver to its own directory.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>