This device is probably broken at this point, but since we want to
remove linux-postmarketos-mainline/stable it really has best chances
to work (somewhat) on linux-postmarketos-qcom-msm8974.
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