Change getPackageUid to getPackageUidAsUser

The wrong overload of PackageManager is being called, setting
USER_SYSTEM as flag instead of the user to resolve the network stack
UID.

Test: phone boots, WiFi works, additional tests in child CLs
Change-Id: I89b11b38c390d0e77a5917c74daccccd74c2d0a3

services/net/java/android/net/NetworkStackClient.java

@@ -203,7 +203,7 @@ public class NetworkStackClient {
         final PackageManager pm = context.getPackageManager();
         int uid = -1;
         try {
-            uid = pm.getPackageUid(comp.getPackageName(), UserHandle.USER_SYSTEM);
+            uid = pm.getPackageUidAsUser(comp.getPackageName(), UserHandle.USER_SYSTEM);
         } catch (PackageManager.NameNotFoundException e) {
             Slog.wtf("Network stack package not found", e);
             // Fall through