Extend support for requestRouteToHostAddress for backward compatibility

The gnss@2.0 HAL and the framework GNSS Location Provider code is
updated in Q to not call the deprecated requestRouteToHost() method.
However, devices upgrading to Q which are still using gnss@1.1 or
earlier HAL must continued to be supported.

Fixes: 121222025
Test: Tested with gnss@1.1 HAL and first API level P.  The
      ConnectivityService log message "This method exists only for
      app backwards compatibility and must not be called by system
      services" is not present for devices with first API level P.

Change-Id: I10199776ea413dc256dbf0771e6cb3eedb334495