[DU01]Remove INetworkManagementService from NetworkStatsService

NetworkStatsService is using INetworkManagementService APIs, which
cannot be accessed after moving into the mainline module. So, replace
and remove those hidden API usages.

Bug: 209738761
Test: atest NetworkStatsServiceTest
Change-Id: I5740f6d8a54e9a06c6dbb93203cb4c954383c3c8

services/java/com/android/server/SystemServer.java

@@ -1837,7 +1837,7 @@ public final class SystemServer implements Dumpable {
 
             t.traceBegin("StartNetworkStatsService");
             try {
-                networkStats = NetworkStatsService.create(context, networkManagement);
+                networkStats = NetworkStatsService.create(context);
                 ServiceManager.addService(Context.NETWORK_STATS_SERVICE, networkStats);
             } catch (Throwable e) {
                 reportWtf("starting NetworkStats Service", e);