Hidden API check exemptions support in runtime.

Test: $ adb shell settings put global hidden_api_blacklist_exemptions \
Test:    Landroid/view/RemoteAnimationDefinition\\\;:Landroid/app/ActivityManager\\\$TaskDescription\\\;
Test: Manually verify logcat output from app which uses named APIs
Bug: 73337509

Change-Id: I5f934b71f95697ce51e7d80a0144af1d77473d91