Add EVDEV_SUPPORT to acpi_button and acpi_lid

[• hselasky]

Summary

On Linux, these ACPI devices are exposed as evdev. This is useful for a bunch of things — libinput disables touchpads when the lid is closed, various DEs can show power-off dialogs when the power is pressed, etc. (While the latter should be doable with devd, a cross-platform solution is nicer.)

Test Plan

Tested libinput's touchpad disablement on my Pixelbook.

Couldn't test acpi_button: the Pixelbook power button is part of the *keyboard*, while on my desktop the button is not getting to that code for some reason.. (no devd event either)

[val_packett.cool]

added diff context

[• hselasky]

sys/dev/acpica/acpi_lid.c

119

Can you test this w/ suspend and resume.

[• hselasky]

Mostly style nits and an init order fix in case of error.