FROMLIST: v4l: add porter duff blend controls

FROMLIST: v4l: add porter duff blend controls

At peresent, we don't have a control for Compositing and Blend.
All drivers are just doing copies while actually many hardwares
supports more functions.

So Adding V4L2 controls for Compositing and Blend, used for for
composting streams.
(am from https://patchwork.linuxtv.org/patch/42848/)
The values are based on porter duff operations.
Defined in below links.
https://developer.xamarin.com/api/type/Android.Graphics.PorterDuff+Mode/

Change-Id: I16245fc8389a433ebdcb228081a80daa48e8c539
Suggested-by: Nicolas Dufresne <nicolas@ndufresne.ca>
Signed-off-by: Jacob Chen <jacob-chen@iotwrt.com>
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>