c2aidl InputSurface: enable InputSurface

Enable InputSurface interface based on flag and system property.

Bug: 201479783
Change-Id: Ib3ab5a2f34e3ef3d74f1cbfecc5aac5354d6957e
diff --git a/media/aconfig/codec_fwk.aconfig b/media/aconfig/codec_fwk.aconfig
index b5c7edf..8162b3f 100644
--- a/media/aconfig/codec_fwk.aconfig
+++ b/media/aconfig/codec_fwk.aconfig
@@ -7,6 +7,7 @@
 
 flag {
   name: "aidl_hal_input_surface"
+  is_exported: true
   namespace: "codec_fwk"
   description: "Feature flags for enabling AIDL HAL InputSurface handling"
   bug: "201479783"