HdrBrightnessModifier: adding LowPowerMode settings listener

HdrBrightnessModifier should respect "allowInLowPowerMode" config, and if not allowed Hdr boost should be disabled in low power mode

Bug: b/356587573
Test: manual testing, atest HdrBrightnessModifierTest
Flag: com.android.server.display.feature.flags.new_hdr_brightness_modifier
Change-Id: I9b8014c5616ad64f33937a3eb119918a4be3e5f0
4 files changed