Add ADB commands to control ambient display

Adds the following ADB commands

'adb shell cmd power suppress-ambient-display <token> true|false'
Controls suppressing ambient display through PowerManager#suppressAmbientDisplay()

'adb shell cmd power list-ambient-display-suppression-tokens'
Prints the tokens suppressing ambient display through the suppress-ambient-display command

Bug: 151138820
Test: Invoking the ADB commands, FrameworksServicesTests:PowerManagerServiceTest
Change-Id: I49686ae60d83a40311ceb0c92732ddb298f0374b