Pre-grant location permisson to location extra packages.

Grant location permission to extra packages configurated in xml config
file. This is necessary as pre-grant happens right after system starts,
before location provider sets the *real* location extra package.

Bug: 119225658
Test: Manual, atest GtsPermissionTestCases:com.google.android.permission.gts.DefaultPermissionGrantPolicyTest

Change-Id: Ibbfbfb78aa062fa6dc013a1001ea3486d62f4331