Use STREAM_VOICE_CALL for ToneGenerator

Previously, we used STREAM_BLUETOOTH_SCO for ringback,
which is incorrect as ringback can not be heard when
using this stream type.

Flag: com.android.server.telecom.flags.use_stream_voice_call_tones
Bug: 363262590
Test: Manual SCO ringback tests, atest TelecomUnitTests
Change-Id: I564e5a0b9852e4570a650e53d869f40aa97d1c2f
diff --git a/flags/telecom_call_flags.aconfig b/flags/telecom_call_flags.aconfig
index ed75f14..2fde55a 100644
--- a/flags/telecom_call_flags.aconfig
+++ b/flags/telecom_call_flags.aconfig
@@ -26,3 +26,14 @@
       purpose: PURPOSE_BUGFIX
     }
 }
+
+# OWNER=breadley TARGET=24Q4
+flag {
+  name: "use_stream_voice_call_tones"
+  namespace: "telecom"
+  description: "Use STREAM_VOICE_CALL only for ToneGenerator"
+  bug: "363262590"
+  metadata {
+      purpose: PURPOSE_BUGFIX
+    }
+}
\ No newline at end of file