watchdog: mtx1-wdt: request gpio before using it

watchdog: mtx1-wdt: request gpio before using it

commit 9b19d40aa3ebaf1078779da10555da2ab8512422 upstream.

Otherwise, the gpiolib autorequest feature will produce a WARN_ON():

WARNING: at drivers/gpio/gpiolib.c:101 0x8020ec6c()
autorequest GPIO-215
[...]

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
[PG: use combo gpio_request+gpio_direction_output vs. gpio_request_one
 to avoid build failure, as per v2.6.32.47 commit 35b6863ce555c ]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>