support A5/4 in Cipher Mode Command

Related: SYS#5324
Change-Id: I780a739b9bfbefd4f58be051794fe1a491823e67
diff --git a/include/osmocom/msc/msc_common.h b/include/osmocom/msc/msc_common.h
index 8a43e69..e7ac559 100644
--- a/include/osmocom/msc/msc_common.h
+++ b/include/osmocom/msc/msc_common.h
@@ -32,6 +32,8 @@
 	uint8_t alg_id;
 	uint8_t key_len;
 	uint8_t key[MAX_A5_KEY_LEN];
+	bool kc128_present;
+	uint8_t kc128[MAX_A5_KEY_LEN];
 };
 
 enum complete_layer3_type {