Add updateLockTaskPackages API to ActivityTaskManager

The API will be available in CTS so that we can use it directly instead
of calling it from other system components.

Bug: 240602359
Test: Build & call the API from CTS
Change-Id: I8aa6ee85adb62cda67479c7213d2bc022acd0eec
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index b31e36c..35bb558 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -704,6 +704,9 @@
     <!-- Permission required for CTS test - CtsKeystoreTestCases -->
     <uses-permission android:name="android.permission.REQUEST_UNIQUE_ID_ATTESTATION" />
 
+    <!-- Permission required for CTS test - CtsWindowManagerDeviceTestCases-->
+    <uses-permission android:name="android.permission.UPDATE_LOCK_TASK_PACKAGES" />
+
     <application android:label="@string/app_label"
                 android:theme="@android:style/Theme.DeviceDefault.DayNight"
                 android:defaultToDeviceProtectedStorage="true"