commit 5a00b6c2 upstream.

The commit 1c6c6952 ("genirq: Reject bogus threaded irq requests")
starts refusing misconfigured interrupt handlers. This makes
intel_mid_powerbtn not working anymore.

Add a mandatory flag to a threaded IRQ request in the driver.

Fixes: 1c6c6952 ("genirq: Reject bogus threaded irq requests")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>