Take into account dummy sub ids in ImsManager verification

am: 08059425

Change-Id: I1508e3f7a6ff392d42045b5786c254e56783439a

src/java/com/android/ims/ImsManager.java

@@ -2443,7 +2443,7 @@ public class ImsManager {
      * @return {@code true} if valid, {@code false} otherwise.
      */
     private boolean isSubIdValid(int subId) {
-        return subId != SubscriptionManager.INVALID_SUBSCRIPTION_ID &&
+        return SubscriptionManager.isValidSubscriptionId(subId) &&
                 subId != SubscriptionManager.DEFAULT_SUBSCRIPTION_ID;
     }
 }