guest-diag: pin_sem_fast.sh - 2 s tracker-sem pinner with a per-pid guard

The 15 s pinner loses the race against the client's internal deadline in
most boots: in the one boot where UVM's page-table write pushes were
submitted the pin had landed early, and later pins (60 s+) left the client
dead before submitting anything. Poll the guest pagemap every 2 s and pin
0x20400f000 once per cdt pid (re-pinning the same pid also stirred the
pump's rewind repeatedly, which is why the guard exists).

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