Add notification pregrant for SCONE

Bug: 233243584
Change-Id: I9bb2b014c7edb665a7c2675e86ff4d67cde94b48
Test: manual
diff --git a/default-permissions.xml b/default-permissions.xml
index 81624d3..50860fe 100644
--- a/default-permissions.xml
+++ b/default-permissions.xml
@@ -66,6 +66,8 @@
     <exception package="com.google.android.apps.scone">
         <!-- Used to call ActivityTransition API for Smart PNO -->
         <permission name="android.permission.ACTIVITY_RECOGNITION" fixed="false"/>
+        <!-- Notifications -->
+        <permission name="android.permission.POST_NOTIFICATIONS" fixed="false"/>
     </exception>
 
     <exception