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>

drivers/media/pci/ddbridge/ddbridge-ci.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * ddbridge-ci.c: Digital Devices bridge CI (DuoFlex, CI Bridge) support
  *

drivers/media/pci/ddbridge/ddbridge-ci.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge-ci.h: Digital Devices bridge CI (DuoFlex, CI Bridge) support
  *

drivers/media/pci/ddbridge/ddbridge-core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * ddbridge-core.c: Digital Devices bridge core functions
  *

drivers/media/pci/ddbridge/ddbridge-hw.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * ddbridge-hw.c: Digital Devices bridge hardware maps
  *

drivers/media/pci/ddbridge/ddbridge-hw.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge-hw.h: Digital Devices bridge hardware maps
  *

drivers/media/pci/ddbridge/ddbridge-i2c.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * ddbridge-i2c.c: Digital Devices bridge i2c driver
  *

drivers/media/pci/ddbridge/ddbridge-i2c.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge-i2c.c: Digital Devices bridge i2c driver
  *

drivers/media/pci/ddbridge/ddbridge-io.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge-io.h: Digital Devices bridge I/O inline functions
  *

drivers/media/pci/ddbridge/ddbridge-main.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * ddbridge.c: Digital Devices PCIe bridge driver
  *

drivers/media/pci/ddbridge/ddbridge-max.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * ddbridge-max.c: Digital Devices bridge MAX card support
  *

drivers/media/pci/ddbridge/ddbridge-max.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge-max.h: Digital Devices bridge MAX card support
  *

drivers/media/pci/ddbridge/ddbridge-regs.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge-regs.h: Digital Devices PCIe bridge driver
  *

drivers/media/pci/ddbridge/ddbridge.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * ddbridge.h: Digital Devices PCIe bridge driver
  *