Set audio mode back to normal before we abandon the audio focus after
call.

Currently, we set the audio mode back to normal after we abandon the
audio focus when the call disconnected. This may cause audio playback
switching delay after the call.

Bug: b/281841785
Test: Manually test audio switching after call using Youtube music.
Change-Id: I5b2db68b4b4d2420be34295064413d8b70daac7e
diff --git a/flags/Android.bp b/flags/Android.bp
index 99e2dc5..450cb1b 100644
--- a/flags/Android.bp
+++ b/flags/Android.bp
@@ -29,6 +29,7 @@
       "telecom_incallservice_flags.aconfig",
       "telecom_default_phone_account_flags.aconfig",
       "telecom_callaudioroutestatemachine_flags.aconfig",
+      "telecom_callaudiomodestatemachine_flags.aconfig",
       "telecom_calllog_flags.aconfig",
       "telecom_resolve_hidden_dependencies.aconfig"
     ],