Intel describes the behavior of their processors as "undefined" if two or

more mappings to the same physical page have different memory types, i.e.,
PAT settings.  Consequently, if pmap_change_attr() is applied to a virtual
address range within the kernel map, then the corresponding ranges of the
direct map also need to be changed.  Enhance pmap_change_attr() to handle
this case automatically.

Add a comment describing what pmap_change_attr() does.

Discussed with:	jhb

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