DO NOT MERGE: Restoring Network Available Notification to AGnssRil

Adds connectivity notification back for SUPL specific
case, needed esp. for case where WiFi is off and a
general purpose connectivity notification doesn't fire.

Bug: 33350903
Fixes: 33350903
Test: On device GPS-still-works checked, as well as notifications
      going into HAL on airplane mode on/off, and SUPL call flows
      (Further AGnssRil check to be done by partners)

Change-Id: I02af0b839d0bfd21dfefedff743208e02ab9c2dd
(cherry picked from commit 41f6bcebaf)

services/core/java/com/android/server/location/GnssLocationProvider.java

@@ -464,6 +464,7 @@ public class GnssLocationProvider implements LocationProviderInterface {
             if (mDownloadXtraDataPending == STATE_PENDING_NETWORK) {
                 xtraDownloadRequest();
             }
+            // Always on, notify HAL so it can get data it needs
             sendMessage(UPDATE_NETWORK_STATE, 0 /*arg*/, network);
         }
 
@@ -480,6 +481,12 @@ public class GnssLocationProvider implements LocationProviderInterface {
      */
     private final ConnectivityManager.NetworkCallback mSuplConnectivityCallback =
             new ConnectivityManager.NetworkCallback() {
+        @Override
+        public void onAvailable(Network network) {
+            // Specific to a change to a SUPL enabled network becoming ready
+            sendMessage(UPDATE_NETWORK_STATE, 0 /*arg*/, network);
+        }
+
         @Override
         public void onLost(Network network) {
             releaseSuplConnection(GPS_RELEASE_AGPS_DATA_CONN);