[SurfaceFlinger] Fix HDR tone mapping.

Previously we tone mapped for all color channels, however, the correct way is
to convert to XYZ color space, and only tone map the Y channel.

BUG: 76220266
Test: Test with modified Youtube apk
Change-Id: Ia00ab32b9d5d9f1d1128d57305ceabbdb68fffcd
1 file changed