Add media perms to DefaultPermissionGrantPolicy

For T, we recently added new permissions:

- READ_MEDIA_AUDIO
- READ_MEDIA_VIDEO
- READ_MEDIA_IMAGES

But, we failed to update DefaultPermissionGrantPolicy(+Test), and
therefore no pre-grants are being given for the new permissions. After
discussion, it was decided that any existing pre-grants for STORAGE
should be extended to these new permissions.

Bug: 229150830
Test: atest DefaultPermissionGrantPolicyTest
Change-Id: I7367c5981196b3c7988a835359b4e8d27b52b074

services/core/java/com/android/server/pm/permission/DefaultPermissionGrantPolicy.java

@@ -207,6 +207,9 @@ final class DefaultPermissionGrantPolicy {
         STORAGE_PERMISSIONS.add(Manifest.permission.READ_EXTERNAL_STORAGE);
         STORAGE_PERMISSIONS.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
         STORAGE_PERMISSIONS.add(Manifest.permission.ACCESS_MEDIA_LOCATION);
+        STORAGE_PERMISSIONS.add(Manifest.permission.READ_MEDIA_AUDIO);
+        STORAGE_PERMISSIONS.add(Manifest.permission.READ_MEDIA_VIDEO);
+        STORAGE_PERMISSIONS.add(Manifest.permission.READ_MEDIA_IMAGES);
     }
 
     private static final Set<String> NEARBY_DEVICES_PERMISSIONS = new ArraySet<>();