Shell: post notifications permission

so the package can send notifications on T+

Bug: 194833441
Change-Id: If38ae3addf6694f2dfe9f3ccc20d9a6495bfc193
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index 867ab3c..c5c3dd7 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -256,6 +256,7 @@
     <uses-permission android:name="android.permission.OBSERVE_ROLE_HOLDERS" />
     <uses-permission android:name="android.permission.STATUS_BAR_SERVICE" />
     <uses-permission android:name="android.permission.STATUS_BAR" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <!-- Permission needed to rename bugreport notifications (so they're not shown as Shell) -->
     <uses-permission android:name="android.permission.SUBSTITUTE_NOTIFICATION_APP_NAME" />
     <uses-permission android:name="android.permission.REQUEST_NOTIFICATION_ASSISTANT_SERVICE" />