Use clearAll() of NetworkCapabilities.Builder instead

NetworkCapabilities#clearAll() is a hidden API, use clearAll()
of NetworkCapabilities.Builder instead.

Bug: 182963415
Test: m ethernet-service
Test: atest EthernetServiceTests
Change-Id: I87745b5f7a5817f95cdbc623b2313c181ff48f19

service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java

@@ -166,8 +166,9 @@ public class EthernetNetworkFactory extends NetworkFactory {
     }
 
     private void updateCapabilityFilter() {
-        NetworkCapabilities capabilitiesFilter = new NetworkCapabilities();
-        capabilitiesFilter.clearAll();
+        NetworkCapabilities capabilitiesFilter = new NetworkCapabilities.Builder()
+                .clearAll()
+                .build();
 
         for (NetworkInterfaceState iface:  mTrackingInterfaces.values()) {
             capabilitiesFilter = mixInCapabilities(capabilitiesFilter, iface.mCapabilities);