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
This addresses the issue here, but only for the devkit:
https://source.puri.sm/Librem5/linux-next/issues/114
I didn't patch the dts for the phone because:
1) I don't have one to test
2) it might negatively impact batter life (I'm only speculating)
[ci:skip-build]: already built successfully in CI