HO: store speech codec list from BSSMAP Assignment in conn

On BSSMAP Assignment Request received from the MSC, store the Speech Codec List
in the subscr conn, so that we may evaluate available codecs during handover
decision. (Will be used, e.g., by handover_decision_2.)

Change-Id: I8222d73085eb777696e365c94214c05d56e6d129
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index b8f8f81..c730d96 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -12,6 +12,7 @@
 #include <osmocom/core/select.h>
 #include <osmocom/core/stats.h>
 #include <osmocom/core/stat_item.h>
+#include <osmocom/gsm/protocol/gsm_08_08.h>
 
 #include <osmocom/crypt/auth.h>
 
@@ -111,6 +112,15 @@
 	unsigned int ho_dtap_cache_len;
 
 	struct penalty_timers *ho_penalty_timers;
+
+	/* "Codec List (MSC Preferred)" as received by the BSSAP Assignment Request. 3GPP 48.008
+	 * 3.2.2.103 says:
+	 *         The "Codec List (MSC Preferred)" shall not include codecs
+	 *         that are not supported by the MS.
+	 * i.e. by heeding the "Codec list (MSC Preferred)", we inherently heed the MS bearer
+	 * capabilities, which the MSC is required to translate into the codec list. */
+	struct gsm0808_speech_codec_list codec_list;
+	bool codec_list_present;
 };