gpio: moxart: add missing .owner to struct gpio_chip

Add missing .owner of struct gpio_chip. This prevents the
module from being removed from underneath its users.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-moxart.c b/drivers/gpio/gpio-moxart.c
index 4ecd195..79b9341 100644
--- a/drivers/gpio/gpio-moxart.c
+++ b/drivers/gpio/gpio-moxart.c
@@ -102,6 +102,7 @@
 	.set			= moxart_gpio_set,
 	.get			= moxart_gpio_get,
 	.ngpio			= 32,
+	.owner			= THIS_MODULE,
 };
 
 static int moxart_gpio_probe(struct platform_device *pdev)