Set the container field of aconfig flags

Test: m
Bug: 312769710
Change-Id: Ib273d42785541476912bac98bb541283df0af5fb
diff --git a/media/aconfig/Android.bp b/media/aconfig/Android.bp
index ee25c03..e0d1fa9 100644
--- a/media/aconfig/Android.bp
+++ b/media/aconfig/Android.bp
@@ -2,6 +2,7 @@
 aconfig_declarations {
     name: "aconfig_mediacodec_flags",
     package: "com.android.media.codec.flags",
+    container: "system",
     srcs: ["mediacodec_flags.aconfig"],
 }
 
@@ -28,6 +29,7 @@
 aconfig_declarations {
     name: "aconfig_codec_fwk_flags",
     package: "android.media.codec",
+    container: "system",
     srcs: ["codec_fwk.aconfig"],
 }
 
diff --git a/media/aconfig/codec_fwk.aconfig b/media/aconfig/codec_fwk.aconfig
index 06aceeb..1475e15 100644
--- a/media/aconfig/codec_fwk.aconfig
+++ b/media/aconfig/codec_fwk.aconfig
@@ -3,6 +3,7 @@
 # !!! Please add flags in alphabetical order. !!!
 
 package: "android.media.codec"
+container: "system"
 
 flag {
   name: "aidl_hal_input_surface"
diff --git a/media/aconfig/mediacodec_flags.aconfig b/media/aconfig/mediacodec_flags.aconfig
index be0fc5c..4d1e5ca 100644
--- a/media/aconfig/mediacodec_flags.aconfig
+++ b/media/aconfig/mediacodec_flags.aconfig
@@ -1,4 +1,5 @@
 package: "com.android.media.codec.flags"
+container: "system"
 
 # ******************************************************************
 #            !!! DO NOT ADD FURTHER FLAGS TO THIS FILE !!!