au1000: keep the MTX-1 watchdog pin low during boot

Do this until the watchdog driver is loaded and the user-space watchdog
daemon can start pinging the watchdog.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 36065

target/linux/au1000/patches-3.6/004-watchdog_low_init.patch

@@ -0,0 +1,12 @@
+--- a/arch/mips/alchemy/board-mtx1.c
++++ b/arch/mips/alchemy/board-mtx1.c
+@@ -100,6 +100,9 @@ void __init board_setup(void)
+ 	alchemy_gpio_direction_output(211, 1);	/* green on */
+ 	alchemy_gpio_direction_output(212, 0);	/* red off */
+ 
++	/* Set watchdog pin low */
++	alchemy_gpio_direction_output(215, 0);
++
+ 	pm_power_off = mtx1_power_off;
+ 	_machine_halt = mtx1_power_off;
+ 	_machine_restart = mtx1_reset;