ARM: exynos_defconfig: Enable ChromeOS EC chardev driver

Exynos Chromebooks have an Embedded Controller known as the ChromeOS EC
Enable the driver that provides an interface to access from user-space.
Signed-off-by: NJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: NKukjin Kim <kgene@kernel.org>

arch/arm/configs/exynos_defconfig

@@ -179,6 +179,8 @@ CONFIG_RTC_DRV_S5M=y
 CONFIG_RTC_DRV_S3C=y
 CONFIG_DMADEVICES=y
 CONFIG_PL330_DMA=y
+CONFIG_CHROME_PLATFORMS=y
+CONFIG_CROS_EC_CHARDEV=y
 CONFIG_COMMON_CLK_MAX77686=y
 CONFIG_COMMON_CLK_MAX77802=y
 CONFIG_COMMON_CLK_S2MPS11=y