V4L/DVB (10667): ov772x: setting method to register is changed.

Color format regs array had been used, but it was not easy to understand
what to want to do, and additional bit became complex.
This patch modify this problem.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>