[ARM] 4089/1: AT91: GPIO wake IRQ cleanup

Cleanup of at91 platform level gpio wake and suspend/resume logic.

The GPIO core now delegates wakeups to the parent AIC by refcounting,
and delegates clock management to the clock API.  This makes these
system modules more independent of each other, which is cleaner and will
also help with the AT91SAM9263 (where some GPIO controllers share the
same irq and clock).

Original patch by David Brownell.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>