gpio: Move the exynos4 GPIO to drivers/gpio

Move the Samsung Exynos4 series SoCs GPIO driver to drivers/gpio

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 3735c05..dbe43b4 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -86,6 +86,12 @@
 	help
 	  Say yes here to support GPIO functionality of IT8761E super I/O chip.
 
+config GPIO_EXYNOS4
+	bool "Samsung Exynos4 GPIO library support"
+	default y if CPU_EXYNOS4210
+	help
+	  Say yes here to support Samsung Exynos4 series SoCs GPIO library
+
 config GPIO_PLAT_SAMSUNG
 	bool "Samsung SoCs GPIO library support"
 	default y if SAMSUNG_GPIOLIB_4BIT