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

core/java/android/permission/DEFAULT_PERMISSION_GRANT_POLICY_OWNERS

+ewol@google.com
+hackbod@google.com
+jsharkey@google.com
+narayan@google.com
+patb@google.com
+svetoslavganov@google.com
+yamasani@google.com
+zhanghai@google.com

services/core/java/com/android/server/pm/permission/OWNERS

 include platform/frameworks/base:/core/java/android/permission/OWNERS
 
-per-file DefaultPermissionGrantPolicy.java = hackbod@android.com
-per-file DefaultPermissionGrantPolicy.java = jsharkey@android.com
-per-file DefaultPermissionGrantPolicy.java = toddke@google.com
-per-file DefaultPermissionGrantPolicy.java = yamasani@google.com
-per-file DefaultPermissionGrantPolicy.java = patb@google.com
+per-file DefaultPermissionGrantPolicy.java = file:platform/frameworks/base:/core/java/android/permission/DEFAULT_PERMISSION_GRANT_POLICY_OWNERS