Revert "Define new AUDIO/VIDEO/IMAGE permissions"

Revert "Fix PermissionPolicyTest and SplitPermissionsSystemTest"

Revert submission 15933906-t-define-media-permissions

Reason for revert: caused b/216588046 and b/216453842
Reverted Changes:
I79afe120d:Update DefaultPermissionGrantPolicyTest for new pe...
I321282b1f:Fix PermissionPolicyTest and SplitPermissionsSyste...
If3d357bae:Define new AUDIO/VIDEO/IMAGE permissions

Change-Id: I0d4f0eaefc5c29063f517755b4c9b61417a15fd0