Was completely undocumented before. Just needed different tagging so it
could be picked up.
No attempt at this stage of sharing more code between the cmu modules.
This clock is the USB High Frequency PLL that gets trimmed based
on clock recovery. It is the most accurate PLL on the system,
assuming it is connected via USB.
Add the definition of this clock in preparation for being able
to switch to it.
Signed-off-by: Sean Cross <sean@xobs.io>
Applies to both, and clearly shows that cmu.h needs to be extracted as
common code.
Originally from: e31d312331
and checked in the HG/LG reference manuals.
