V4L/DVB (10671): sh_mobile_ceu: SOCAM flags are not platform dependent

sh_mobile_ceu_camera.c support for signal polarity flags isn't platform
dependent, provide them locally. Only the bus width is implementation
specific.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Acked-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>