Added the high usage hidden APIs back

Added the high usage hidden APIs back for Q or older
apps. Apps built on R SDK should use the new API
getNetworkCountryIso(int).

Test: Build
Bug: 150368215
Change-Id: I1ccfbe269f3d9b91b715c20bd2f200cfb20e2a8c

telephony/java/android/telephony/TelephonyManager.java

@@ -2831,6 +2831,17 @@ public class TelephonyManager {
         }
     }
 
+    /**
+     * @hide
+     * @deprecated Use {@link #getNetworkCountryIso(int)} instead.
+     */
+    @Deprecated
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.Q,
+            publicAlternatives = "Use {@link #getNetworkCountryIso(int)} instead.")
+    public String getNetworkCountryIsoForPhone(int phoneId) {
+        return getNetworkCountryIso(phoneId);
+    }
+
     /*
      * When adding a network type to the list below, make sure to add the correct icon to
      * MobileSignalController.mapIconSets() as well as NETWORK_TYPES