Allow apps who target R to send users directly to AppPermission page

If app holds foreground permission, then it can send the user to the app
permission page (up to a rate limit) in order to get background location.
Also if the app is targeting R, it can't request both background and
foreground at the same time and it needs to request background permission
as a singleton.

Test: PermissionsHostTest + manual
Bug: 144389816
Change-Id: I3b3378080093b85022cbf137c4fde24672844104