ARM: exynos_defconfig: Enable GPIO buttons and RTC drivers

Many of the boards use GPIO-mapped buttons for generic input.
For Arndale board, these buttons also serve as wakeup source.

And the issues reported in commit 522ccdb6 ("ARM: dts:
Disable the RTC by default on exynos5") are no longer reproduced
on EXYNOS5250 based systems. Hence it would be better to re-enable
RTC support for EXYNOS5250.
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
[mturquette@linaro.org: ack on RTC enabling]
Acked-by: Mike Turquette <mturquette@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/configs/exynos_defconfig

@@ -50,6 +50,7 @@ CONFIG_USB_USBNET=y
 CONFIG_USB_NET_SMSC75XX=y
 CONFIG_USB_NET_SMSC95XX=y
 CONFIG_INPUT_EVDEV=y
+CONFIG_KEYBOARD_GPIO=y
 CONFIG_KEYBOARD_CROS_EC=y
 # CONFIG_MOUSE_PS2 is not set
 CONFIG_MOUSE_CYAPA=y
@@ -104,6 +105,8 @@ CONFIG_MMC_SDHCI_S3C=y
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_IDMAC=y
 CONFIG_MMC_DW_EXYNOS=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_S3C=y
 CONFIG_COMMON_CLK_MAX77686=y
 CONFIG_EXT2_FS=y
 CONFIG_EXT3_FS=y