Enable the android.window.PROPERTY_ACTIVITY_EMBEDDING_SPLITS_ENABLED property

Future WM Jetpack library updates will ask for the property to
enable ActivityEmbedding feature.

Bug: 264733035
Test: build pass
Change-Id: I0f5e5a10250049fb9425eac7c113b803b6701cc7
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0ea4981..ccd6b77 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -146,6 +146,10 @@
 
         <uses-library android:name="org.apache.http.legacy" />
 
+        <property
+            android:name="android.window.PROPERTY_ACTIVITY_EMBEDDING_SPLITS_ENABLED"
+            android:value="true" />
+
         <!-- Settings -->
         <activity android:name=".homepage.SettingsHomepageActivity"
                   android:label="@string/settings_label_launcher"