Limit HLG to 4.926x SDR

HLG is universally too bright on basically every single platform that
supports HDR. Fix this for Android.

Bug: 362510107
Flag: com.android.graphics.surfaceflinger.flags.begone_bright_hlg
Test: HLG playback
Change-Id: I5d464c016be62b11f6a3cc1ab228e14d198afb15
6 files changed