PIP: Prevent onboarding activity from launching on pinned stack

Bug: 27153338
Change-Id: I7a3b5c5306e0760495b43b0deb612b3e711ad56e
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index c74e411..9e07c6d 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -335,6 +335,7 @@
             android:exported="true"
             android:theme="@style/PipTheme"
             android:launchMode="singleTop"
+            android:taskAffinity=""
             android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"
             android:resizeable="true"
             android:supportsPictureInPicture="true"
@@ -345,6 +346,7 @@
             android:exported="true"
             android:theme="@style/PipTheme"
             android:launchMode="singleTop"
+            android:taskAffinity=""
             android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"
             android:resizeable="true"
             android:supportsPictureInPicture="true"