genirq: Add IRQF_RESUME_EARLY and resume such IRQs earlier

This adds a mechanism to resume selected IRQs during syscore_resume
instead of dpm_resume_noirq.

Under Xen we need to resume IRQs associated with IPIs early enough
that the resched IPI is unmasked and we can therefore schedule
ourselves out of the stop_machine where the suspend/resume takes
place.

This issue was introduced by 676dc3cf5bc3 "xen: Use IRQF_FORCE_RESUME".

Signed-off-by: Ian Campbell <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: xen-devel <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Cc: [email protected] (at least to 2.6.32.y)
Signed-off-by: Thomas Gleixner <[email protected]>

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