fix build.

PhoneInterfaceManager was referencing the old .mSubId in SubInfoRecord,
changed to use new name .subId.

Change-Id: I5d58eb575921713dd64cec2978fafac654cf5277
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 3183ff5..8e487e1 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -788,7 +788,7 @@
         boolean isValid = false;
         List<SubInfoRecord> slist = SubscriptionManager.getActiveSubInfoList();
         for (SubInfoRecord subInfoRecord : slist) {
-            if (subInfoRecord.mSubId == subId) {
+            if (subInfoRecord.subId == subId) {
                 isValid = true;
                 break;
             }