arm64: dts: allwinner: h5: Add device tree for Bananapi M2 Plus H5

The Bananapi M2 Plus H5 is a variant of the original Bananapi M2 Plus,
with the H3 SoC replaced with an H5. Everything else is the same.

Add a stub device tree incorporating the shared bananapi-m2-plus dtsi
file.

Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>