HO: clearly mark conn penalty timer member for hodec2

The conn's penalty timers will be used only for handover decision 2, make it
clear by a sub-struct.

hodec2 will also initialize the penalty timer list on demand only, so no need
to always initialize.

Change-Id: Ie6c2bc2b10dc424dfd94a9e11a9a62f51c48aa10
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 65fb32b..bf87595 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -115,7 +115,9 @@
 	struct llist_head ho_dtap_cache;
 	unsigned int ho_dtap_cache_len;
 
-	struct penalty_timers *ho_penalty_timers;
+	struct {
+		struct penalty_timers *penalty_timers;
+	} hodec2;
 
 	/* "Codec List (MSC Preferred)" as received by the BSSAP Assignment Request. 3GPP 48.008
 	 * 3.2.2.103 says: