media: add codec_fwk.null_output_surface flag

Bug: 297920102
Change-Id: I29bb096c8cc2b84beaec59b2b0f08248ffe19b7b
diff --git a/media/aconfig/codec_fwk.aconfig b/media/aconfig/codec_fwk.aconfig
index 2a70ae6..183bd99 100644
--- a/media/aconfig/codec_fwk.aconfig
+++ b/media/aconfig/codec_fwk.aconfig
@@ -17,3 +17,10 @@
   description: "Feature flag for HLG editing support"
   bug: "316397061"
 }
+
+flag {
+  name: "null_output_surface"
+  namespace: "codec_fwk"
+  description: "Feature flag for null output Surface support"
+  bug: "297920102"
+}