Disconnect EmergencyNumberTracker as the source of getNetworkCountryIso

EmergencyNumberTracker would not provide a shared country ISO through
getNetworkCountryIso.

Test: Treehugger
Bug: 182404592
Change-Id: I08270197d2729a80065106039d9ad8eecc39b7d0
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 05ed622..b60a36f 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -2798,9 +2798,7 @@
             if (sst == null) return "";
             LocaleTracker lt = sst.getLocaleTracker();
             if (lt == null) return "";
-            if (!TextUtils.isEmpty(lt.getCurrentCountry())) return lt.getCurrentCountry();
-            EmergencyNumberTracker ent = phone.getEmergencyNumberTracker();
-            return (ent == null) ? "" : ent.getEmergencyCountryIso();
+            return lt.getCurrentCountry();
         } finally {
             Binder.restoreCallingIdentity(identity);
         }