[MQ] Add framework implementation for ambient backlight

Add implementation for the below APIs:

registerAmbientBacklightCallback()
setAmbientBacklightSettings()
setAmbientBacklightEnabled()

Test: atest CtsMediaQualityTestCases:android.media.mediaquality.cts.MediaQualityTest
Flag: android.media.tv.flags.media_quality_fw
Bug: 377079429
Bug: 388925200
Bug: 388926344
Bug: 388925613

Change-Id: Ib88f95dbce16dd418000eea966601b0b68211dbb