Add feature flag to fix the media type of accept when answering via MMI code

Bug: 286499659
Test: build pass
Change-Id: Icc7c7115be2e78eaf0a2d304d3a8c7fac879a2bb
diff --git a/flags/ims.aconfig b/flags/ims.aconfig
index b2cc904..7af23a9 100644
--- a/flags/ims.aconfig
+++ b/flags/ims.aconfig
@@ -69,3 +69,13 @@
     description: "This flag controls whether framework supports SIP subscribe retry or not"
     bug:"297023230"
 }
+
+flag {
+    name: "answer_audio_only_when_answering_via_mmi_code"
+    namespace: "telephony"
+    description: "This flag changes the media type when answering incoming call via MMI code"
+    bug:"286499659"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}