in ran_msg, return gsm0808_speech_codec (inter-MSC)

Get rid of enum mgcp_codecs in inter-MSC handover related code.

Change-Id: I9c649f98738a55b8637ae600d5cdf81099fd08e5
diff --git a/include/osmocom/msc/msc_ho.h b/include/osmocom/msc/msc_ho.h
index a3f60c7..ca5618e 100644
--- a/include/osmocom/msc/msc_ho.h
+++ b/include/osmocom/msc/msc_ho.h
@@ -81,7 +81,7 @@
 		struct osmo_sockaddr_str ran_remote_rtp;
 		/* The codec from Handover Request Acknowledge. */
 		bool codec_present;
-		enum mgcp_codecs codec;
+		struct gsm0808_speech_codec codec;
 
 		/* Inter-MSC voice forwarding via MNCC, to the remote MSC. The Prepare Handover Response sent us the
 		 * Handover Number the remote MSC assigned. This is a call to that Handover Number, via PBX.