wl12xx: remove unused wl12xx_hw_init_mem_config()

The function declaration is a leftover from some earlier, already
removed, code.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Reviewed-by: Vidhya Govindan <vidhya.govindan@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_init.h

@@ -28,7 +28,6 @@
 
 int wl12xx_hw_init_hwenc_config(struct wl12xx *wl);
 int wl12xx_hw_init_templates_config(struct wl12xx *wl);
-int wl12xx_hw_init_mem_config(struct wl12xx *wl);
 int wl12xx_hw_init_rx_config(struct wl12xx *wl, u32 config, u32 filter);
 int wl12xx_hw_init_phy_config(struct wl12xx *wl);
 int wl12xx_hw_init_beacon_filter(struct wl12xx *wl);