Prepare for better device categorization by moving everything to testing
subdir first.
[skip-ci]: chicken-egg problem: passing pmaports CI depends on pmbootstrap MR
depends on this MR
Related: postmarketos#16
With this patch the power button (the one you use to turn it on)
suspends the device. This should allow to save more energy with respect
to just turning the screen off (slider button).
I tested myself on Nokia N900.
[ci:skip-build]: already built successfully in CI