Add CarrierConfig to hide Preset APN setting details

Add new key to hide Preset APN setting details. When the key is set to
true, Preset APN is still shown and selectable in APN list, however,
user cannot enter APN editor view. It means details of Preset APN will
be hidden from user.

Test: manual - check Preset APN setting details are hidden
Bug: 115453290
Change-Id: I8a5c6f92f876d349b304acf89b4ffab86ff3f24b
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 90c15ff..3b44463 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1828,6 +1828,13 @@
             "notify_international_call_on_wfc_bool";
 
     /**
+     * Flag to hide Preset APN details. If true, user cannot enter ApnEditor view of Preset APN,
+     * and cannot view details of the APN. If false, user can enter ApnEditor view of Preset APN.
+     * Default value is false.
+     */
+    public static final String KEY_HIDE_PRESET_APN_DETAILS_BOOL = "hide_preset_apn_details_bool";
+
+    /**
      * Flag specifying whether to show an alert dialog for video call charges.
      * By default this value is {@code false}.
      * @hide
@@ -2595,6 +2602,7 @@
         sDefaults.putBoolean(KEY_DISPLAY_VOICEMAIL_NUMBER_AS_DEFAULT_CALL_FORWARDING_NUMBER_BOOL,
                 false);
         sDefaults.putBoolean(KEY_NOTIFY_INTERNATIONAL_CALL_ON_WFC_BOOL, false);
+        sDefaults.putBoolean(KEY_HIDE_PRESET_APN_DETAILS_BOOL, false);
         sDefaults.putBoolean(KEY_SHOW_VIDEO_CALL_CHARGES_ALERT_DIALOG_BOOL, false);
         sDefaults.putStringArray(KEY_CALL_FORWARDING_BLOCKS_WHILE_ROAMING_STRING_ARRAY,
                 null);