[wakelock] Add module for virtual wakelocks. Contributes to JB#32462
MCE has multitude of reasons for blocking late suspend. Using real wakelocks for each reason pollutes the kernel bookkeeping data and using dynamically named wakelocks would make things even worse. Add mce-wakelock module that multiplexes virtual wakelocks internal to mce into just one real sysfs based wakelock.
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