Allow apps to getProviders() without location permissions.

This restores MR0's behavior in this regard - apps calling
LocationManager.getProviders() or LocationManager.getBestProvider()
will no longer receive a SecurityException if they do not have
any location permissions. Instead, as was the behavior in MR0, they
only receive providers that their permissions grant them access to,
including an empty list if they have no permission whatsoever.

Bug: 7207864
Change-Id: I027df425e258d436c4821c34a25bc46a2a292824