Added a category for lockscreen settings.

Bug: 62487664
Test: Built and flashed a system image, ran RunSettingsLibRoboTests.
Change-Id: I4f2b09622ec221caf9898d03fbad1db354c264ea
diff --git a/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java b/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java
index 9d09737..e067de1 100644
--- a/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java
+++ b/packages/SettingsLib/src/com/android/settingslib/drawer/CategoryKey.java
@@ -34,6 +34,8 @@
     public static final String CATEGORY_SOUND = "com.android.settings.category.ia.sound";
     public static final String CATEGORY_STORAGE = "com.android.settings.category.ia.storage";
     public static final String CATEGORY_SECURITY = "com.android.settings.category.ia.security";
+    public static final String CATEGORY_SECURITY_LOCKSCREEN =
+            "com.android.settings.category.ia.lockscreen";
     public static final String CATEGORY_ACCOUNT = "com.android.settings.category.ia.accounts";
     public static final String CATEGORY_SYSTEM = "com.android.settings.category.ia.system";
     public static final String CATEGORY_SYSTEM_LANGUAGE =