Input: retu-pwrbutton - pass the IRQF_ONESHOT flag

Input: retu-pwrbutton - pass the IRQF_ONESHOT flag

Since commit 4df38d498ad64972ee3673764423aafee2fb341b ("genirq: Reject
bogus threaded irq requests") threaded IRQs without a primary handler
need to be requested with IRQF_ONESHOT, otherwise the request will fail.

So pass the IRQF_ONESHOT flag in this case.

The semantic patch that makes this change is available
in scripts/coccinelle/misc/irqf_oneshot.cocci.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>