Align HLG and PQ color management to 203 nits == SDR max by default

The public HLG and PQ definitions map 203 nits to SDR white by scaling
the respective transfer functions.

Bug: 278121691
Bug: 278122024
Test: HwAccelerationTest test gradients
Test: HDR test videos match DPU and GPU composition
Test: SilkFX test HLG and PQ images
Change-Id: Id830e2ac72f5bcf8566556053fcf3af6b945581b