Deprecate QNS network disable reason BAD_LINK

WifiNetworkAgent#unwanted no longer disables the network.

Bug: 28558417
Change-Id: I2e7ed99ae4cb952f124c673376d967eeee2b4ece
(cherry picked from commit 4156d615707a7aa27ecaf55c889824fd025a75b5)
diff --git a/wifi/java/android/net/wifi/WifiConfiguration.java b/wifi/java/android/net/wifi/WifiConfiguration.java
index a64bfe5..7db160f 100644
--- a/wifi/java/android/net/wifi/WifiConfiguration.java
+++ b/wifi/java/android/net/wifi/WifiConfiguration.java
@@ -817,6 +817,7 @@
          */
         public static final int NETWORK_SELECTION_ENABLE = 0;
         /**
+         * @deprecated it is not used any more.
          * This network is disabled because higher layer (>2) network is bad
          */
         public static final int DISABLED_BAD_LINK = 1;
@@ -870,7 +871,7 @@
          */
         public static final String[] QUALITY_NETWORK_SELECTION_DISABLE_REASON = {
                 "NETWORK_SELECTION_ENABLE",
-                "NETWORK_SELECTION_DISABLED_BAD_LINK",
+                "NETWORK_SELECTION_DISABLED_BAD_LINK", // deprecated
                 "NETWORK_SELECTION_DISABLED_ASSOCIATION_REJECTION ",
                 "NETWORK_SELECTION_DISABLED_AUTHENTICATION_FAILURE",
                 "NETWORK_SELECTION_DISABLED_DHCP_FAILURE",