flags: add leaudio_multiple_vocs_instances_api

Bug: 323156655
Bug: 315241296
Test: mmm packages/modules/Bluetooth
Tag: #feature
Change-Id: Ifeba7a7ce4eb4a4cc1ce981be59097fd120a2de0

flags/leaudio.aconfig

@@ -120,4 +120,11 @@ flag {
     metadata {
         purpose: PURPOSE_BUGFIX
     }
+}
+
+flag {
+    name: "leaudio_multiple_vocs_instances_api"
+    namespace: "bluetooth"
+    description: "Support multiple audio outputs for volume offset"
+    bug: "323156655"
 }
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