gpio/samsung: fix broken configuration for EXYNOS4 GPIO banks

Commit 1b39d5f2 introduced new common gpio driver for all Samsung GPIO
SoCs. The new driver doesn't work correctly on Samsung Exynos4 SoC. It
fails to set configuration for all but external interrupt pins. This
patch fixes this issue.
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

drivers/gpio/gpio-samsung.c

@@ -446,6 +446,8 @@ static struct samsung_gpio_cfg s3c24xx_gpiocfg_banka = {
 static struct samsung_gpio_cfg exynos4_gpio_cfg = {
 	.set_pull	= exynos4_gpio_setpull,
 	.get_pull	= exynos4_gpio_getpull,
+	.set_config	= samsung_gpio_setcfg_4bit,
+	.get_config	= samsung_gpio_getcfg_4bit,
 };
 
 static struct samsung_gpio_cfg s5p64x0_gpio_cfg_rbank = {