Create aconfig flag for media in scene container

Bug: 296122467
Test: make
Flag: ACONFIG com.android.systemui.media_in_scene_container DEVELOPMENT
Change-Id: Idc8e69b9da152ee8054d4ef9366b8110f627fd92
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 68d4b63..a745ab5 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -140,4 +140,11 @@
     namespace: "systemui"
     description: "Move LightRevealScrim to recommended architecture"
     bug: "281655028"
-}
\ No newline at end of file
+}
+
+flag {
+   name: "media_in_scene_container"
+   namespace: "systemui"
+   description: "Enable media in the scene container framework"
+   bug: "296122467"
+}