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Some latest Intel platforms(Icelake, Tigerlake) support two yuv MPO
planes. This CL add a workaround to promote two video quads to overlays
on Intel platforms. Previous test has showed this will benefit power
consumption when playing two videos simultaneously.

Bug: 1105618
Change-Id: I5fc44a5064d371a2fdad97dc63068c328ed55a46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592629Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Maggie Chen <magchen@chromium.org>
Commit-Queue: Richard Li <richard.li@intel.com>
Cr-Commit-Position: refs/heads/master@{#837928}