/wakeup

AT91 CF updates, mostly for power management:

 - Add suspend/resume methods to the AT91 CF driver, disabling
   non-wakeup IRQs during system suspend.  The card detect IRQ
   serves as a wakeup event source.

 - Convert the driver to the more-current "platform_driver" style.

So inserting or removing a CF card will wake the system, unless that
has been disabled by updating the sysfs file; and there will be no
more warnings about spurious IRQs during suspend/resume cycles.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
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