Upgraded from 4.9 to 5.2.1, apm no longer works?

[Darren Pilgrim]

I had RELENG_4_9 working flawlessly on an older machine.  I upgraded to
5.2.1-R by means of wiping and installing from scratch, then source-upgraded
to RELENG_5_2.  The computer does not have ACPI support, only APM.  The
kernel has "device apm" compiled in and hint.apm.0.disable="0" in
/boot/loader.conf, but no apm device is detected.  Subsequently, `apm -e
enable` fails:

apm: can't open /dev/apm: No such file or directory

The only reason I use APM on this machine is so that `init 0` turns the
machine off rather than just halting.  How do I get this functionality back?
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