Add "wifi lost" disconnect cause.

New disconnect cause used when wifi call is dropped due to loss of wifi
connection.

Test: Manual, unit.
Merged-In: Iedaa9f54ff6dbfe90a6ce01fc9eb0aad126d05f0
Bug: 32571209
Change-Id: Iedaa9f54ff6dbfe90a6ce01fc9eb0aad126d05f0
diff --git a/telephony/java/com/android/ims/ImsReasonInfo.java b/telephony/java/com/android/ims/ImsReasonInfo.java
index 56b8822..c71808c 100644
--- a/telephony/java/com/android/ims/ImsReasonInfo.java
+++ b/telephony/java/com/android/ims/ImsReasonInfo.java
@@ -308,6 +308,11 @@
     public static final int CODE_DATA_DISABLED = 1406;
 
     /**
+     * Indicates a call was disconnected due to loss of wifi signal.
+     */
+    public static final int CODE_WIFI_LOST = 1407;
+
+    /**
      * Network string error messages.
      * mExtraMessage may have these values.
      */