When a sparc machine is running with serial console, the zskbd probe would

try to use short cuts, and would not correctly initialize its channel if a
keyboard is connected to it, which might have been done on purpose.
It would then become impossible to run X11 on this machine afterwards.

Fix this by being more cautious during the probe, at the extent of a couple
of seconds if no keyboard is present.

Tested by various, ok deraadt@

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