Allow to exempt apps from restrictions to RECORD_AUDIO

- Extend the concept if "isPrivilidged" to a generic "RestrictionBypass"
  class so that we can add more variants of bypassing.
- Add a new way of bypassing by using a new permission.
- Always except resolvable UIDs (root, shell, media_uid, audioserver,
  cameraserver, system server) from restrictions.

Fixes: 141210120
Test: atest -m CtsAppOpsTestCases FrameworksMockingServicesTests:AppOpsServiceTest FrameworksMockingServicesTests:AppOpsUpgradeTest
Change-Id: I3ca555e9370aa0003400429ee7ab12e95c62a042