media: i2c: ov4689: Implement manual color balance controls
The OV4689 sensor has separate red and blue gain settings (up to 4x). Implement appropriate controls in the driver. Default gain values are not modified. Signed-off-by: Mikhail Rudenko <mike.rudenko@gmail.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
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