Add support for orange pi zero 3

[didiercrunch]

It would be awesome if periph adds support for the orange pi zero 3. The orange pi zero 3 uses the H618 processor from allwinner which is a derivative from the H616.

• Hardware: orange pi zero 3

Do you plan to:

• Contribute an initial driver: Yes
• Write unit tests: Yes
• Update https://github.com/periph/cmd to use the new functionality: No