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
Kernel is downstream. System boots. Flash the device using the netcat
method to an external SD (use the entire SD, not a partition, as the
target device) because the internal memory is too small.
