media: ov5675: fix vflip/hflip control

Set/clear the bits to configure the register to expected value
to assume the v/hflip state.

Signed-off-by: Shawn Tu <shawnx.tu@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>