wakeup: Use irqsave/irqrestore for events_lock

Jon Medhurst (Tixy) recently noticed a problem with the
events_lock usage. One of the Android patches that uses
wakeup_sources calls wakeup_source_add() with irqs disabled.
However, the event_lock usage in wakeup_source_add() uses
spin_lock_irq()/spin_unlock_irq(), which reenables interrupts.
This results in lockdep warnings.

The fix is to use spin_lock_irqsave()/spin_lock_irqrestore()
instead for the events_lock.

Full bug report here:
https://bugs.launchpad.net/linaro-landing-team-arm/+bug/1037565

Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Android Team <kernel-team@android.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Jon Medhurst (Tixy) <tixy@linaro.org>
Reported-and-debugged-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
modified for Tuna Kernel from Linux 3.5+ by faux123