Document Content Light Level and Mastering Display v4l2 colorimetry
controls.
Signed-off-by: NStanimir Varbanov <stanimir.varbanov@linaro.org>
Reviewed-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab+huawei@kernel.org>