udev: Make libinput ignore PMIC key press events
The PMICs power button handling generates an event on long press which confuses userspace as it already sees event from SVNS. Let's make libinput ignore it.
This helps Phosh's power-button menu on long press as otherwise pressing the button for too long will trigger the PMICs power button events which will then blank/lock the device.
Edited by Guido Gunther