Add aconfig flag for notifications autogroup summary icon updates

Flag: NA
Test: m -j
Bug: 227693160
Change-Id: I43ad2c1d35239d01cc76706303008adfbcd73ba7

services/core/java/com/android/server/notification/flags.aconfig

diff --git a/services/core/java/com/android/server/notification/flags.aconfig b/services/core/java/com/android/server/notification/flags.aconfig
index da01745..55d8a0f 100644
--- a/services/core/java/com/android/server/notification/flags.aconfig
+++ b/services/core/java/com/android/server/notification/flags.aconfig
@@ -33,4 +33,11 @@
   namespace: "systemui"
   description: "This flag controls the vibrate while unlocked setting of polite notifications"
   bug: "270456865"
-}
\ No newline at end of file
+}
+
+flag {
+  name: "autogroup_summary_icon_update"
+  namespace: "systemui"
+  description: "This flag controls the fix for notifications autogroup summary icon updates"
+  bug: "227693160"
+}