dts: arm: introduce amebad SOC Devicetree

add initial version of devicetree for amebad SOC.
amebad devicetree file is main platform dtsi file, which should
be included from board dts (e.g rtl872xd_evb.dts)

Signed-off-by: zjian zhang <zjian_zhang@realsil.com.cn>
1 file changed