Remove fdc_alloc_resources, which should have happened in last commit.

Fix the pccard attachment to have a chance of working.
Move the resource allocation into the bus front ends.

Don't depend on implicit include of machine/bus.h in sys/rman.h, but instead
explicitly include it.

Remove unnecessary softc bzero calls.

Update in preparation for adding the ACPI attachment.
* Add an fdtype ivar. This will be the equivalent of fd->type.
* Move enabling the FIFO to the end of attach.
* Unify reset code into fdc_initia

Update in preparation for adding the ACPI attachment.
* Add an fdtype ivar. This will be the equivalent of fd->type.
* Move enabling the FIFO to the end of attach.
* Unify reset code into fdc_initial_reset().
* Add fdc_write_ivar().
* Update isa and pccard attachments accordingly.
* Set the flags unconditionally in probe since they may be overridden by
other probe routines. Both before and now, we're depending on probe
being called a final time on the winning driver so the flags we get are
the ones we intended.
* Use the bus accessor macros instead of defining our own.
* Remove duplicate assigns of fd->type.

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Break out the isa and pccard front ends from fdc. This is the first
step in making this driver more attachment neutral. Others plan on
adding acpi front ends.

Still need to cleanup the MI part of

Break out the isa and pccard front ends from fdc. This is the first
step in making this driver more attachment neutral. Others plan on
adding acpi front ends.

Still need to cleanup the MI part of the driver because it isn't as
bus independent as it could be.

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