Convert m68k pmap from physseg to VM_PAGE_MD.

This allows us to remove some ambiguities on how some functions are called,
remove some diagnostic checks for conditions that can never happen and
remove the ugly hack with "pmap_initialized".

Then, rework internal function interfaces and some logic so as to stop
fetching vm_page from a pa and the reverse every now and then - this makes
some pmap operations run much faster.

per art@'s idea.

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