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
[ci:skip-build]: will not finish in time. I've built linux-asus-me176c
and it builds fine. I'm assuming that
linux-teclast-x80pro will also build, since it is
pretty much the vanilla kernel.