This pull-request adds a new subsystem for genpd providers in drivers/genpd

and starts moving some of the corresponding code in there.

We have currently ~60 users of the genpd provider interface, which are
sprinkled across various subsystems. To release some burden from the soc
maintainers (Arnd Bergmann, etc) in particular, but also to gain a better
overall view of what goes on in the area, I will help out with maintenance.
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