Pull up following revision(s) (requested by tsutsui in ticket #1008):
	sys/arch/next68k/next68k/pmap_bootstrap.c: revision 1.43
Move physmem calculations before nptpage initialization.
Should fix next68k specific part of PR port-m68k/45915
(panic: pmap_enter_ptpage: can't get KPT page), and
this is the last possible m68k MD part of this PR.
Note this change is not tested on the actual machine (yet),
but as noted in comment next68k/pmap_bootstrap.c is based on
the mvme68k one which has been fixed by the similar diff.
Should be pulled up to all netbsd-6 branches.
Ticket 1008.