Expand chan allocation logging

Log more data related to channel allocation:
- channel type
- number of paging attempts
- timers fired

Change-Id: Ib417a9c942c17b902dd80ff555cd9da5f91bff48
diff --git a/openbsc/src/libbsc/bsc_api.c b/openbsc/src/libbsc/bsc_api.c
index 8a4c85f..7a48296 100644
--- a/openbsc/src/libbsc/bsc_api.c
+++ b/openbsc/src/libbsc/bsc_api.c
@@ -397,7 +397,8 @@
 			handle_mr_config(conn, conn->lchan, full_rate);
 
 		LOGP(DMSC, LOGL_NOTICE,
-		     "Sending ChanModify for speech: %s on channel %s\n",
+		     "Sending %s ChanModify for speech: %s on channel %s\n",
+		     gsm_lchan_name(conn->lchan),
 		     get_value_string(gsm48_chan_mode_names, chan_mode),
 		     get_value_string(gsm_chan_t_names, conn->lchan->type));
 		gsm48_lchan_modify(conn->lchan, chan_mode);