tstest/natlab/vmtest: use -icount for gokrazy VMs under TCG

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On hosts without hardware virtualization, gokrazy VMs can hang at
boot with no console output. Timing jitter under software emulation
breaks the kernel's early boot timer calibration, causing it to spin
waiting for timer interrupts that never arrive.

Passing -icount shift=auto ties virtual clocks to instruction execution,
making timer calibration deterministic and preventing the boot hang.

Updates #cleanup

Change-Id: I7c0aa96e5344041af9a7246f7d50bed1da47ab95
Signed-off-by: Francois Marier <francois@tailscale.com>

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