Panic with latest pmap lock changes.

[Justin Hibbits]

Looks like I spoke too soon about the pmap lock changes working on my
G4.  After about 24 hours of uptime, it panicked with the following:

_rw_wlock_hard: recursing but non-recursive rw pmap pv global
@ /home/chmeee/freebsd/src/sys/powerpc/aim/mmu_oea.c:2301

I think the attached patch should fix it (Untested, except for
compiling).

- Justin
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