[mainline] getTetherApnRequired API rename to isTetherApnRequired

Bug: 142365448
Test: Build pass.
      atest TetheringConfigurationTest (PASS)

Change-Id: I80f2dc99f14057c98a9855de9987c4d8b34dffa3
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 238e853..cc6925d 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -4911,7 +4911,7 @@
      * @hide
      */
     @Override
-    public boolean getTetherApnRequiredForSubscriber(int subId) {
+    public boolean isTetherApnRequiredForSubscriber(int subId) {
         enforceModifyPermission();
         final long identity = Binder.clearCallingIdentity();
         final Phone phone = getPhone(subId);