Input: twl4030-pwrbutton - use correct device for irq request

The interrupt should be requested for the platform device
and not for the input device.

Fixes: 7f9ce649

 ("Input: twl4030-pwrbutton - simplify driver using devm_*")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>