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Until system wide colorspace support is improved, force planes to BT601
for consistency across platforms and kernel versions.

Bug: 1102317
Change-Id: Ice5a1221b5a142a5c163288d4261eca2fb1c611c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336347Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: David Stevens <stevensd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796687}