V4L/DVB (9245): video: add header to soc_camera_platform include file

Update the soc_camera_platform header with licensing information.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>