board: samsung: add initial Espresso7420 board support

Espresso7420 is a development/evaluation board for Exynos7420 SoC. It
includes multiple onboard compoments (EMMC/Codec) and various
interconnects (USB/HDMI).

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index d1f8e22..da25715 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -21,6 +21,7 @@
 	exynos5420-peach-pit.dtb \
 	exynos5800-peach-pi.dtb \
 	exynos5422-odroidxu3.dtb
+dtb-$(CONFIG_EXYNOS7420) += exynos7420-espresso7420.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += \
 	rk3288-firefly.dtb \
 	rk3288-jerry.dtb \