google_pixel: Disable NotificationAssistant

* Activity doesn't exist in non-Pixel GMS provided AS.

overlays/overlay-gms/frameworks/base/core/res/res/values/config.xml

@@ -82,9 +82,6 @@
     -->
     <string name="config_defaultAppPredictionService" translatable="false">com.google.android.as/com.google.android.apps.miphone.aiai.app.AiAiPredictionService</string>
 
-    <!-- Component name that should be granted Notification Assistant access -->
-    <string name="config_defaultAssistantAccessComponent" translatable="false">com.google.android.as/com.google.android.apps.miphone.aiai.common.notification.service.AiAiNotificationAssistantService</string>
-
     <!-- The component name for the default system attention service.
          This service must be trusted, as it can be activated without explicit consent of the user.
          See android.attention.AttentionManagerService.