[media] V4L: mt9m111: rewrite set_pixfmt

added new bit offset defines,
more supported BE colour formats
and also support BGR565 swapped pixel formats

removed pixfmt helper functions and option flags
setting the configuration register directly in set_pixfmt

added reg_mask function

reg_mask is basically the same as clearing & setting registers,
but it is more convenient and faster (saves one rw cycle).

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Philipp Wiesner <p.wiesner@phytec.de>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
[g.liakhovetski@gmx.de: remove Bayer swap, forward-port, rename macros]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>