ARM: EXYNOS4: Add keypad device helpers

This patch adds the samsung_keypad_cfg_gpio() for EXYNOS4.
Now, this helpers are only for keypad operating in PORT-0.

Signed-off-by: Naveen Krishna Ch <ch.naveen@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
index 8b841e6..8a007cc 100644
--- a/arch/arm/mach-exynos4/Kconfig
+++ b/arch/arm/mach-exynos4/Kconfig
@@ -65,6 +65,11 @@
 	help
 	  Common setup code for i2c bus 7.
 
+config EXYNOS4_SETUP_KEYPAD
+	bool
+	help
+	  Common setup code for keypad.
+
 config EXYNOS4_SETUP_SDHCI
 	bool
 	select EXYNOS4_SETUP_SDHCI_GPIO