This is in preparation for adding in support for the OnePlus 5T
(dumpling) on top of the regular OnePlus 5 (cheeseburger).
Both devices use the same kernel so the name change just makes sense.
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