wl1271: add support for HW TX fragmentation

Indicate to mac80211 we support HW fragmentation.
Support updates of the fragmentation threshold via the
set_frag_threshold callback.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
diff --git a/drivers/net/wireless/wl12xx/acx.h b/drivers/net/wireless/wl12xx/acx.h
index f41a9c1..75a6306 100644
--- a/drivers/net/wireless/wl12xx/acx.h
+++ b/drivers/net/wireless/wl12xx/acx.h
@@ -1161,7 +1161,7 @@
 int wl1271_acx_tid_cfg(struct wl1271 *wl, u8 queue_id, u8 channel_type,
 		       u8 tsid, u8 ps_scheme, u8 ack_policy,
 		       u32 apsd_conf0, u32 apsd_conf1);
-int wl1271_acx_frag_threshold(struct wl1271 *wl);
+int wl1271_acx_frag_threshold(struct wl1271 *wl, u16 frag_threshold);
 int wl1271_acx_tx_config_options(struct wl1271 *wl);
 int wl1271_acx_mem_cfg(struct wl1271 *wl);
 int wl1271_acx_init_mem_config(struct wl1271 *wl);