arm64: dts: meson-axg: add clock DT info for Meson AXG SoC

Try to add Hiubus DT info, and also enable clock DT info
for the Amlogic's Meson-AXG SoC.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Qiufang Dai <qiufang.dai@amlogic.com>
Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>