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/init.c b/drivers/net/wireless/wl12xx/init.c
index 492edc0..7949d34 100644
--- a/drivers/net/wireless/wl12xx/init.c
+++ b/drivers/net/wireless/wl12xx/init.c
@@ -290,7 +290,7 @@
 		goto out_free_memmap;
 
 	/* Default fragmentation threshold */
-	ret = wl1271_acx_frag_threshold(wl);
+	ret = wl1271_acx_frag_threshold(wl, wl->conf.tx.frag_threshold);
 	if (ret < 0)
 		goto out_free_memmap;