ARM: SAMSUNG: remove unused SAMSUNG_GPIOLIB_4BIT Kconfig parameter

This removes the SAMSUNG_GPIOLIB_4BIT Kconfig parameter,
which was no longer used anywhere in the source code
and Makefiles.
Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/Kconfig

@@ -740,7 +740,6 @@ config ARCH_S3C64XX
 	select S3C_DEV_NAND
 	select S3C_GPIO_TRACK
 	select SAMSUNG_ATAGS
-	select SAMSUNG_GPIOLIB_4BIT
 	select SAMSUNG_WAKEMASK
 	select SAMSUNG_WDT_RESET
 	select USB_ARCH_HAS_OHCI

arch/arm/plat-samsung/Kconfig

@@ -24,7 +24,6 @@ config PLAT_S5P
 	select S3C_GPIO_TRACK
 	select S5P_GPIO_DRVSTR
 	select SAMSUNG_CLKSRC if !COMMON_CLK
-	select SAMSUNG_GPIOLIB_4BIT
 	help
 	  Base platform code for Samsung's S5P series SoC.
 
@@ -115,13 +114,6 @@ config S5P_GPIO_INT
 
 # options for gpio configuration support
 
-config SAMSUNG_GPIOLIB_4BIT
-	bool
-	help
-	  GPIOlib file contains the 4 bit modification functions for gpio
-	  configuration. GPIOlib shall be compiled only for S3C64XX and S5P
-	  series of processors.
-
 config S5P_GPIO_DRVSTR
 	bool
 	help