[media] V4L: Add MATRIX option to V4L2_CID_EXPOSURE_METERING control

This patch adds a menu option to the V4L2_CID_EXPOSURE_METERING
control for multi-zone metering.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>