wl12xx: Use chipset specific join commands

Add implementation to use chipset specific join commands.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index c38aa54..c673cdb 100644
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -165,6 +165,8 @@
 	int (*op_plt_init)(struct wl12xx *wl);
 	void (*op_tx_flush)(struct wl12xx *wl);
 	void (*op_fw_version)(struct wl12xx *wl);
+	int (*op_cmd_join)(struct wl12xx *wl, u8 bss_type, u8 dtim_interval,
+			    u16 beacon_interval, u8 wait);
 
 	struct wl12xx_partition_set *p_table;
 	enum wl12xx_acx_int_reg *acx_reg_table;