Merge patch series "Add Huashan Pi board support"

Inochi Amaoto <[email protected]> says:

Huashan Pi board is an embedded development platform based on the
CV1812H chip. Add minimal device tree files for this board.
Currently, it can boot to a basic shell.

NOTE: this series is based on the Jisheng's Milk-V Duo patch.

Link: https://en.sophgo.com/product/introduce/huashan.html
Link: https://en.sophgo.com/product/introduce/cv181xH.html
Link: https://lore.kernel.org/linux-riscv/[email protected]/
Signed-off-by: Conor Dooley <[email protected]>