Add feature flag for multichannel group audio device type

Flag: android.media.audio.enable_multichannel_group_device
Bug: 344031109
Test: Build
Change-Id: I4fef6ae02036f229c587a081b1714615bb4f73cc
diff --git a/media/audio/aconfig/audio_framework.aconfig b/media/audio/aconfig/audio_framework.aconfig
index 0b434f7..38b543e 100644
--- a/media/audio/aconfig/audio_framework.aconfig
+++ b/media/audio/aconfig/audio_framework.aconfig
@@ -32,6 +32,17 @@
     bug: "374751406"
 }
 
+flag {
+    name: "enable_multichannel_group_device"
+    namespace: "media_audio"
+    description:
+        "Enable new audio device type for wireless connected speaker group"
+        "supporting multichannel content."
+    is_exported: true
+    is_fixed_read_only: true
+    bug: "344031109"
+}
+
 flag{
     name: "enable_ringtone_haptics_customization"
     namespace: "media_audio"