guest-diag: keep CE push-buffer latches on stale refresh; never fail freshness on an unknown page PAHEADmaster

Two scanner defects seen in r131: (1) a resolved CE mem whose first vmap
page could not be translated at store time stored page_pa=0, and the
freshness check then failed on every probe, dropping the latch and
re-resolving in a tight loop - and each failed re-resolution left the host
with no pins for the channel at all; (2) the stale path discarded the latch
before knowing the re-resolution would produce anything. Unknown PA now
counts as fresh (the {cpu,gpu} object check is the evidence), and a stale
refresh keeps the previous latch unless a new resolution actually emits
runs.

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