staging: bcm2835-camera: Activate V4L2_EXPOSURE_METERING_MATRIX handling

I don't see any reason to keep this TODO, so activate the
V4L2_EXPOSURE_METERING_MATRIX handling.

Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1585485901-10172-3-git-send-email-stefan.wahren@i2se.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>