Add experimental APM support for some laptops.

If the configuration option PSM_HOOKAPM is defined and the APM device
is available, the psm driver will issue the ENABLE command to the
pointing device at the resume APM event if the device was open when
the system went into suspended mode. If the option
PSM_RESETAFTERSUSPEND is specified in addition to PSM_HOOKAPM, the
driver will try to reset the pointing device before sending the
ENABLE command.

Built-in PS/2-type pointing devices in some laptops (all the reports I
heard were about Toshiba models) sometimes don't work immediately
after the system is resumed. The device MAY become available after a
while. The system may exhibit the same symptom in other OS's too
(no, FreeBSD is not the only OS that is suffering :-).

I don't know the correct way of solving this yet, but it's been
reported that issuing the ENABLE command after resumption wakes up the
pointing device.

Without PSM_HOOKAPM, the psm driver behaves in the same way as before.

Problem reported in the bsd-nomads mailing list in Japan.

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