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
* add dev-package
* modularize some kernel drivers
* modernize Makefile to silence some warnings
* fix various warnings
* add some CVE patches
[ci:skip-build]: already built successfully in CI