staging: davinci: add SPDX License Identifier

Add missing SPDX License Identifier to the source and header files.
Reported by checkpatch.
Signed-off-by: Ioannis Valasakis <code@wizofe.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/davinci_vpfe/davinci_vpfe_user.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipe.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipe.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipe_hw.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipe_hw.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipeif.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipeif.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_ipipeif_user.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_isif.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_isif.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_isif_regs.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_resizer.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/dm365_resizer.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/vpfe.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/vpfe_mc_capture.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/vpfe_video.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *

drivers/staging/media/davinci_vpfe/vpfe_video.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2012 Texas Instruments Inc
  *