ChromeOS: Use sRGB primaries

Instead of rendering to a buffer with the primaries reported by the
EDID, instead render to an sRGB buffer. The CTM is programmed to
convert (slightly incorrectly, but it's the best we can do with the
matrix if broken hardware) from the sRGB primaries to the primaries
reported by the EDID.

This will fix flickering of Rec709 videos on wide color gamut
displays.

Bug: b/282220742
Change-Id: Iea78c00e8e8b2d8e9113f38189a7320108abec5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5554190
Reviewed-by: Sasha McIntosh <sashamcintosh@chromium.org>
Commit-Queue: ccameron chromium <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1303920}