media: ddbridge: Remove useless license text when SPDX-License-Identifier is already used

An SPDX-License-Identifier is already in place. There is no need to
duplicate part of the corresponding license.

While at it, a few comments at the end of some .h files have been updated
to reflect the correct include guard name (missing '_' and co.)

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

media: ddbridge: header/boilerplate cleanups and cosmetics

Cleanup blank lines, remove wrong links to
http://www.gnu.org/copyleft/gpl.html (the driver is licensed under the
terms of GPLv2, but the link points to a copy of the GPLv3), and fix
the filename reference in ddbridge-i2c.h.

[mchehab@kernel.org: removed whitespace changes at the licensing text,
as we didn't get any acks from the authors with regards to changing
the text]
Cc: Ralph Metzler <rjkm@metzlerbros.de>
Cc: Manfred Voelkel <mvoelkel@DigitalDevices.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

media: ddbridge: add SPDX license identifiers

Since the boilerplates and MODULE_LICENSE are now in sync regarding the
used license (GPL v2 only), add a matching GPLv2 SPDX license identifier
to all files of the ddbridge driver.

Cc: Ralph Metzler <rjkm@metzlerbros.de>
Cc: Manfred Voelkel <mvoelkel@DigitalDevices.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

media: ddbridge: move CI detach code to ddbridge-ci.c

Move the CI teardown code to ddbridge-ci.c where everything else related
to CI hardware lives.

Cc: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

media: ddbridge: split off CI (common interface) from ddbridge-core

Move all CI device support related code from ddbridge-core to ddbridge-ci,
following the previously split off MaxS4/8 support.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>