Rasperry Pi clock support

[Eric Anholt]

I'm also avoiding requests to set rate/state when they're a no-op, as
apparently no-op changes to pixel clock break the firmware-configured
display setup.  It *shouldn't* change anything, but I've confirmed
that setting the CPU clock works fine, and after a couple of weeks of
prodding pixel clock now, I'm at a loss for what's going on with it.

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