Add setDeviceMobilityState() to AbstractWifiService.

This fixes build breakage caused by IWifiManager.idl change.

TBR=hugobenichi
Bug: None
Test: m -j for master-arc-dev branch, cheets-* targets

Merged-in: Id26478c6825a575b12de71f8262365e1f9777302
Change-Id: Id26478c6825a575b12de71f8262365e1f9777302
(cherry picked from commit f34828276befe5ad0dc262be62d338b7c2c8698b)

wifi/java/com/android/server/wifi/AbstractWifiService.java

@@ -467,6 +467,11 @@ public abstract class AbstractWifiService extends IWifiManager.Stub {
         throw new UnsupportedOperationException();
     }
 
+    @Override
+    public void setDeviceMobilityState(int state) {
+        throw new UnsupportedOperationException();
+    }
+
     @Override
     public void startDppAsConfiguratorInitiator(IBinder binder, String enrolleeUri,
             int selectedNetworkId, int netRole, IDppCallback callback) {