Rename ImsPhone.getRoamingState -> getLastKnownRoamingState

Bug: 172975077
Test: make
Merged-In: I0cba5b2b4a34ef21810c984ab94b077b300389ed
Change-Id: I0cba5b2b4a34ef21810c984ab94b077b300389ed
diff --git a/src/com/android/phone/ImsUtil.java b/src/com/android/phone/ImsUtil.java
index 0825cfb..ba4ad38 100644
--- a/src/com/android/phone/ImsUtil.java
+++ b/src/com/android/phone/ImsUtil.java
@@ -165,7 +165,7 @@
     private static boolean getLastKnownRoamingState(int phoneId) {
         try {
             ImsPhone imsPhone = (ImsPhone) (PhoneFactory.getPhone(phoneId).getImsPhone());
-            return imsPhone.getRoamingState();
+            return imsPhone.getLastKnownRoamingState();
         } catch (NullPointerException | ClassCastException e) {
             return false;
         }