Extend IAGnss.hal to address requestRouteToHost deprecation

The framework networking component method requestRouteToHost() in
class ConnectivityManager used to support the IAGnss.hal interface
is deprecated. This requires changes to the IAGnss.hal interface
to pass network handle to the GNSS HAL implementation in order
to setup SUPL connections.

Bug: 25876485
Test: atest VtsHalGnssV2_0TargetTest on cuttlefish
Change-Id: If0ecd480879da37508f710620975a198e674f3df