Remove the unused field "pc_prvspace" from the MD fields for the struct pcpu. There's not even a thing such as a "struct pcup". While I'm there, remove a comment that makes no sense for arm.
Remove the unused field "pc_prvspace" from the MD fields for the struct
pcpu. There's not even a thing such as a "struct pcup".
While I'm there, remove a comment that makes no sense for arm.

Spotted out by:	Mark Tinguely

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