config: Move smdkv310 to use common exynos4 file

Most of the smdkv310 features are common with other exynos4 boards. To
permit easier addition of driver model support, use the common file and
add a device tree file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/configs/smdkv310_defconfig b/configs/smdkv310_defconfig
index 44da273..0d1a24f 100644
--- a/configs/smdkv310_defconfig
+++ b/configs/smdkv310_defconfig
@@ -2,3 +2,4 @@
 +S:CONFIG_ARM=y
 +S:CONFIG_ARCH_EXYNOS=y
 +S:CONFIG_TARGET_SMDKV310=y
+CONFIG_DEFAULT_DEVICE_TREE="exynos4210-smdkv310"