ACPI / PM: Use standard device wakeup facilities for ACPI wakeup devices

Hi,

This series of patches causes standard device wakeup facilities to be used
with ACPI wakeup devices, like buttons.

[1/4] - Modify /proc/acpi/wakeup not to enable multiple devices at a time to
        wake up the system from sleep states, even if they share a GPE.

[2/4] - Use standard device wakeup flags for handling ACPI wakeup devices.

[3/4] - Remove special ACPI wakeup flags.

[4/4] - Report wakeup events for ACPI buttons and lids.

The patches have been tested with Toshiba Portege R500.

Thanks,
Rafael

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