mesa-dri-swrast no longer exists and just installs,
mesa-dri-gallium. However, this might not always be the case, so
let's change it before it causes any issues.
[ci:ignore-count]
[ci:skip-build]
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