Add constants which can be used by Privacy Setting

-Add a category key for privacy settings
-Add two metrics constants for privacy settings

Test: robotest
Bug: 116628158
Change-Id: Id9b210cc44bcc421c67525c4919d99586525bfc2
diff --git a/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java b/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java
index dd8bfda..92fd868 100644
--- a/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java
+++ b/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java
@@ -51,6 +51,8 @@
     public static final String CATEGORY_GESTURES = "com.android.settings.category.ia.gestures";
     public static final String CATEGORY_NIGHT_DISPLAY =
             "com.android.settings.category.ia.night_display";
+    public static final String CATEGORY_PRIVACY =
+            "com.android.settings.category.ia.privacy";
 
     public static final Map<String, String> KEY_COMPAT_MAP;