DisplayPowerController uses max desired SDR/HDR ratio

When an application requests a smaller max designed SDR/HDR ratio than
what is supported by the system, DisplayPowerController should clamp to
the smallest ratio bigger than 1.0.

Bug: 267350616
Test: SilkFX test app
Change-Id: I933ca05c1f336ee2102489bbc850d42bcf612c4c