ARM: at91: dt: add device tree file for SAMA5D4ek board

Add reference SAMA5D4-EK platform DT file.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index b8c5cd3..a152849 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -48,6 +48,8 @@
 dtb-$(CONFIG_ARCH_AT91)	+= sama5d34ek.dtb
 dtb-$(CONFIG_ARCH_AT91)	+= sama5d35ek.dtb
 dtb-$(CONFIG_ARCH_AT91)	+= sama5d36ek.dtb
+# sama5d4
+dtb-$(CONFIG_ARCH_AT91)	+= at91-sama5d4ek.dtb
 
 dtb-$(CONFIG_ARCH_ATLAS6) += atlas6-evb.dtb
 dtb-$(CONFIG_ARCH_AXXIA) += axm5516-amarillo.dtb