ARM: at91: add MPA 1600 DT board

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
[nicolas.ferre@atmel.com: remove unneeded address-cells and size-cells to gpio-keys]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 9c62558..4c7f8a8 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -3,6 +3,7 @@
 # Keep at91 dtb files sorted alphabetically for each SoC
 # rm9200
 dtb-$(CONFIG_ARCH_AT91) += at91rm9200ek.dtb
+dtb-$(CONFIG_ARCH_AT91) += mpa1600.dtb
 # sam9260
 dtb-$(CONFIG_ARCH_AT91) += animeo_ip.dtb
 dtb-$(CONFIG_ARCH_AT91) += aks-cdu.dtb