Add new machine driver, tested with Weibu F3C MiniPC.

Based heavily on code provided by David Yang @ Everest, and other
machine drivers in the same directory.
Signed-off-by: NDavid Yang <yangxiaohua@everest-semi.com>
[drake@endlessm.com: cleanups and modernization]
Signed-off-by: NDaniel Drake <drake@endlessm.com>
Signed-off-by: NMark Brown <broonie@kernel.org>