power x 0.
pccardc power x 0 used to disable the slot. But a suspend/resume
would reactivate the pccard. It no longer does that. Now the
disabling of the slot is sticy until it is reset with power x 1 or the
card is ejected. This seems closer to correct behavior to me.
o Process all card state changes the same using pccard_do_stat_change().
o Cleanup disabling the card so that we can preserve the state after
the change. Basically, don't set it to empty as often as we do.
o On suspend, the new state is "empty" and the laststate is "suspend"
o Document state machine with a diagram of states and edges. The
edges are labeld to tell the reader what event causes the external
state changes.
o "machdep.pccard.pcic_resume_reset" may be obsolete now. We always
call the bridge driver's resume method on resume now. Otherwise cards
won't automatically show up. If it needs to stay, I'll add it back.
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