bsc_api: Make the cipher_mode take the 'include imei sv' argument

The cipher mode command should enable encryption and send the
right RR message to the other side.
diff --git a/openbsc/include/openbsc/bsc_api.h b/openbsc/include/openbsc/bsc_api.h
index 2062752..a82b0ae 100644
--- a/openbsc/include/openbsc/bsc_api.h
+++ b/openbsc/include/openbsc/bsc_api.h
@@ -29,7 +29,7 @@
 int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, struct msgb *msg, int link_id);
 int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_type, int audio);
 int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
-			uint8_t *key, int len);
+			const uint8_t *key, int len, int include_imeisv);
 int gsm0808_page(struct gsm_bts *bts, unsigned int page_group,
 		 unsigned int mi_len, uint8_t *mi, int chan_type);
 int gsm0808_clear(struct gsm_subscriber_connection *conn);
diff --git a/openbsc/src/bsc_api.c b/openbsc/src/bsc_api.c
index c8ef4f4..0dcb72b 100644
--- a/openbsc/src/bsc_api.c
+++ b/openbsc/src/bsc_api.c
@@ -317,7 +317,7 @@
 }
 
 int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
-			uint8_t *key, int len)
+			const uint8_t *key, int len, int include_imeisv)
 {
 	return -1;
 }