Unify owners for default permission grant policy.

The list of owners is taken from:
- frameworks/base/services/core/java/com/android/server/pm/permission/OWNERS
- cts/common/device-side/util-axt/src/com/android/compatibility/common/util/OWNERS
- vendor/xts/gts-tests/tests/permission/src/com/google/android/permission/gts/OWNERS

Test: presubmit
Change-Id: I3cc073d4890a4295caba8b04752a02f1e00db03c