drm_hwcomposer: Add support for pixel blend mode property
Rebased copy of !16 (closed), also fixed the commit tags (they were corrupted with 's avatar), guessing copy/paste gone horribly wrong.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Rebased copy of !16 (closed), also fixed the commit tags (they were corrupted with 's avatar), guessing copy/paste gone horribly wrong.