r496h do not pin a linear window for content-scanned rings; the VAS walk resolves the rest

The registered COPY_SERVER_PDES directory walks the ring VA correctly
(trace: L0 -> L1 -> L2 idx 9 -> PD0), but the linear window pin installed
around the ring shadows it in svc_lookup_trusted (pin_lookup_any returns
the win-flagged entry first), so the pushbuffer/tracker reads kept using
the wrong noncontiguous guess. Pin only the content-validated ring page;
every other VA of the client now resolves through the walk.

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