drm/msm/dpu: Ignore alpha for XBGR8888 format
Alpha enable in the pixel format will help in selecting the blend rule. By keeping alpha enable to true we are allowing foreground alpha to blend with the layer. If alpha is don't care, then we should not allow pixel alpha to be part of blend equation. Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org> Signed-off-by: Sean Paul <seanpaul@chromium.org>
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