vt: Use a taskqueue to clear splash_cpu logos

[markj]

Summary

vt_fini_logos() calls vtbuf_grow(), which reallocates the console
window's buffer using malloc(M_WAITOK). Because vt_fini_logos() is
called via a callout, we end up panicking if INVARIANTS is enabled.

Fix the problem simply by clearing the logos using a timed taskqueue.
taskqueue_thread is formally allowed to sleep; of course, if we actually
end up sleeping to satisfy the allocation, then we have bigger problems.

Deferring logo initialization to SI_SUB_TASKQ doesn't have a visible
effect.

PR: 260896

[emaste]

sys/dev/vt/vt_cpulogos.c

266

As an aside I wonder if we have a preference for taskqueue_enqueue_timeout_sbt now (and vt_splash_cpu_duration * SBT_1S)

[markj]

sys/dev/vt/vt_cpulogos.c

266

Generally yes, so that regular tasks can be scheduled with appropriate precision. Here it doesn't really matter since the task runs only once.