arm64: dts: Add mediatek MT8173 SoC and evaluation board dts and Makefile

Add device tree support for MT8173 SoC and evaluation board based on it.

Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Acked-by: Arnd Bergmann <arnd at arndb.de>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
index 3b8d427..89124e4 100644
--- a/arch/arm64/boot/dts/Makefile
+++ b/arch/arm64/boot/dts/Makefile
@@ -2,6 +2,7 @@
 dts-dirs += apm
 dts-dirs += arm
 dts-dirs += cavium
+dts-dirs += mediatek
 
 always		:= $(dtb-y)
 subdir-y	:= $(dts-dirs)