gpio: Move to Samsung common GPIO library to drivers/gpio

It's common gpiolib for recent Samsung SoCs. Move 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 ebd1124..3735c05 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_PLAT_SAMSUNG
+	bool "Samsung SoCs GPIO library support"
+	default y if SAMSUNG_GPIOLIB_4BIT
+	help
+	  Say yes here to support Samsung SoCs GPIO library
+
 config GPIO_PL061
 	bool "PrimeCell PL061 GPIO support"
 	depends on ARM_AMBA