Add OBSERVE_APP_USAGE permission to shell for CTS test.

Bug: 123314449
Test: atest android.content.pm.cts.LauncherAppsTest
Change-Id: I5e58aefa9920dd4a974d24388f8ecd8dea7936b3
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index c3c3f25..1e0e3b3 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -165,6 +165,7 @@
 
     <uses-permission android:name="android.permission.CONTROL_KEYGUARD" />
     <uses-permission android:name="android.permission.SUSPEND_APPS" />
+    <uses-permission android:name="android.permission.OBSERVE_APP_USAGE" />
     <uses-permission android:name="android.permission.READ_CLIPBOARD_IN_BACKGROUND" />
     <!-- Permission needed to wipe the device for Test Harness Mode -->
     <uses-permission android:name="android.permission.ENABLE_TEST_HARNESS_MODE" />