ARM: SAMSUNG: Update the name of regarding Samsung GPIO

According to gpio-samsung.c, this patch updates the name of
regarding Samsung GPIO. Basically the samsung_xxx prefix is
used in gpio-samsung.c instead of s3c_xxx, because unified
name can reduce its complexity.

Note: some s3c_xxx stil remains because it is used widely.
It will be updated next time.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-s3c2412/gpio.c b/arch/arm/mach-s3c2412/gpio.c
index 3404a87..4526f6b 100644
--- a/arch/arm/mach-s3c2412/gpio.c
+++ b/arch/arm/mach-s3c2412/gpio.c
@@ -28,7 +28,7 @@
 
 int s3c2412_gpio_set_sleepcfg(unsigned int pin, unsigned int state)
 {
-	struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
+	struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
 	unsigned long offs = pin - chip->chip.base;
 	unsigned long flags;
 	unsigned long slpcon;