ipmi/opal: Enable polled mode and proper callback

Fix a NULL dereference that would occur any time an ioctl() was done, due to a
missing ipmi_enqueue_request callback. Just use the default for now,

ipmi/opal: Enable polled mode and proper callback

Fix a NULL dereference that would occur any time an ioctl() was done, due to a
missing ipmi_enqueue_request callback. Just use the default for now, until we
decide to properly enable IPMI interrupts.

Reported by: kbowling

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Support building IPMI as a module on powerpc64

This still only supports IPMI via OPAL on powerpc64, but now it can be tested
with a GENERIC kernel.