Test DisplayDeviceConfig.initFromDefaultValues

Additionally:
- add missing tests for DisplayDeviceConfig.isAutoBrightnessAvailable()
- merge the INVALID_NITS constants

Bug: 316864327
Test: atest DisplayDeviceConfigTest
Test: atest LocalDisplayAdapterTest
Change-Id: Ic8b0285e469bc4814f1425d63388e638c395d8f2
3 files changed