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powerpc64/mmu: Make moea64_pvo_enter() return if an entry already exists

Summary:
Instead of searching for a PVO entry before adding, take advantage of
the fact that RB_INSERT() returns NULL if it inserts, and the existing entry if
an entry exists, without inserting a new entry.  This saves an extra tree
traversal in the cases where the PVO does not exist.

Reviewed by:    luporl
Differential Revision: https://reviews.freebsd.org/D20944

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