Change provider packages API to test all providers

This will replace the LocationManager.getNetworkProviderPackage() API
with LocationManager.isProviderPackage(). The network provider should
not be considered special.

In addition, providers now have the ability to specify additional
packages that may make location requests on their behalf, so that those
packages can be considered location providers as well.

Bug: 117177078
Test: manually
Change-Id: I204b56e7bb40874ac3347988474fb8afa787feb8

location/java/android/location/LocationManager.java

@@ -2424,6 +2424,22 @@ public class LocationManager {
         }
     }
 
+    /**
+     * Returns true if the given package name matches a location provider package, and false
+     * otherwise.
+     *
+     * @hide
+     */
+    @SystemApi
+    public boolean isProviderPackage(String packageName) {
+        try {
+            return mService.isProviderPackage(packageName);
+        } catch (RemoteException e) {
+            e.rethrowFromSystemServer();
+            return false;
+        }
+    }
+
     /**
      * Set the extra location controller package for location services on the device.
      *