Add aconfig flag for notification optimized linearlayout

Bug: 316110233
Test: adb shell device_config put systemui com.android.systemui.enable_notif_linearlayout_optimized true
Flag: None
Change-Id: I6dda2a1895b2494948b94d8f944246af829ea250
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 3236130..d8c0250 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -357,3 +357,10 @@
    description: "Enables styled focus states on pin input field if keyboard is connected"
    bug: "316106516"
 }
+
+flag {
+   name: "enable_notif_linearlayout_optimized"
+   namespace: "systemui"
+   description: "Enables notification specific LinearLayout optimization"
+   bug: "316110233"
+}