SUN8I and SUN50I (H3, H5, A83T and A64) have a second clock controller
unit. It controls the clocks for the second gpio controller, the IR
controller etc ...
Support for A83T is not supported.
Tested On: OrangePi One, Pine64
Since Linux 4.9-4.10 DTS doesn't have clocks under /clocks but only a ccu node.
Currently only H3 is supported with almost the same state as HEAD.
(video pll aren't supported for now but we don't support video).
This driver and clocks will also be used for other SoC (A64, A31, H5, H2 etc ...)
Reviewed by: jmcneill
Differential Revision: https://reviews.freebsd.org/D9517
