drm/msm/sde: add blending support for more use cases

Update mixer/blending configuration to support different
use cases, opaque blending, and alpha blending configs. Also
fixes layer mixer hw programming offsets to support these.

Change-Id: I0073a98740f23370da704f7ddc4642ad7fd10551
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>
2 files changed