arm: dts: MediaTek: add device tree for MT7629

This patch adds MT7629 device tree and the includes it needs.

Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 55f3fd1..c8e2645 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -563,6 +563,9 @@
 
 dtb-$(CONFIG_SOC_K3_AM6) += k3-am654-base-board.dtb k3-am654-r5-base-board.dtb
 
+dtb-$(CONFIG_ARCH_MEDIATEK) += \
+	mt7629-rfb.dtb
+
 targets += $(dtb-y)
 
 # Add any required device tree compiler flags here