Show permission group icon on the right of PermissionUsageFragment.

This modifies PermissionUsageFragment so that each entry contains the
icon for the permission group on the right.

Bug: 63532550
Test: Open all users of PermissionUsagePreference and see permission
group icons only on PermissionUsageFragment.

Change-Id: Id08609c0165a63cf46fabe43654d0da47518a349