Allow more concurrent notifications

Test: atest
Bug: 161321402
Change-Id: Iabc796b83015f64bdbc3e4c43a97e63c3350b25b
diff --git a/services/core/java/com/android/server/notification/NotificationManagerService.java b/services/core/java/com/android/server/notification/NotificationManagerService.java
index 2fe7833..8dc7b93 100755
--- a/services/core/java/com/android/server/notification/NotificationManagerService.java
+++ b/services/core/java/com/android/server/notification/NotificationManagerService.java
@@ -318,7 +318,7 @@
     static final boolean DEBUG_INTERRUPTIVENESS = SystemProperties.getBoolean(
             "debug.notification.interruptiveness", false);
 
-    static final int MAX_PACKAGE_NOTIFICATIONS = 25;
+    static final int MAX_PACKAGE_NOTIFICATIONS = 50;
     static final float DEFAULT_MAX_NOTIFICATION_ENQUEUE_RATE = 5f;
 
     // message codes