Add carrier package name field to check for carrier vvm app.

The carrier's vvm app's package name will be checked so that if it is
already installed, the dialer vvm will be disabled.

Bug: 2112648e#
Change-Id: I0433037f3bc5c5a380c76a03090d61c430e47e4b

telephony/java/android/telephony/CarrierConfigManager.java

@@ -229,6 +229,14 @@ public class CarrierConfigManager {
      */
     public static final String STRING_VVM_TYPE = "string_vvm_type";
 
+    /**
+     * The package name of the carrier's visual voicemail app to ensure that dialer visual voicemail
+     * and carrier visual voicemail are not active at the same time.
+     *
+     * @hide
+     */
+    public static final String STRING_CARRIER_VVM_PACKAGE_NAME = "string_carrier_vvm_package_name";
+
     // These variables are used by the MMS service and exposed through another API, {@link
     // SmsManager}. The variable names and string values are copied from there.
     public static final String BOOL_MMS_ALIAS_ENABLED = "aliasEnabled";