Bug#845559: micro-evtd: service start failed since kernel 4.8

[Ryan Tandy]

It looks like micro-evtd just uses the GPIO to watch for the power 
button being pressed. The feature is optional (guarded by #define). If 
we could get the kernel to do that instead, we could omit the GPIO 
monitoring.

Something like
https://www.kernel.org/doc/Documentation/devicetree/bindings/input/gpio-keys.txt
or
https://www.kernel.org/doc/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
maybe...