Abolish per-CPU RTAS args

[Joel Schopp]

> Currently we store RTAS arguments in the PACA.  The args have to be in
> the RMO, but since we have a global spinlock for RTAS anyway, there's
> no reason to have a separate copy of the args per-CPU.  This patch
> replaces the PACA field with a single instance in the global rtas
> structure.

To get this patch to compile I had to add the attached patch, which
fixes some more implicit includes of rtas.h. If you know how to get
mozilla mail to inline files instead of attaching them please let me know.

Will test the combined patch soon.

-Joel

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