Address SUPL connection requestRouteToHost deprecation

The method ConnectivityManager.requestRouteToHost() has long been
deprecated. The IAGnss.hal interface, implementation, and the
corresponding framework code must be changed to address this issue.
See b/25876485 for details and solution.

Bug: 25876485
Test: Tested with code instrumentation to verify that the
      @2.0::AGnss.hal dataConnOpen() method implementation
      is called with correct arguments.
Test: Verified @1.0::AGnss.hal backward compatibility on a
      Pixel 3 device.
Change-Id: Ide8030a3d792755a515c936d2fb40ad3726d8fb9