Revert "Add above_background_load function to allow stuff to happen only when"

This reverts commit 6bc817061df0d5c942f08bb04fbc1775ce80109f.
Revert "Updated BFS to v0.413"

This reverts commit 0636ec01e639c4a6d3cf42a78132b61afc0eb6b1.
Revert "Added Brain F**k Scheduler (BFS)"

This reverts commit 3d606b321b3d0a781d5342955ca7f6f05f6bb1cd.
Revert "added SLQB memory allocator @DooMLoRD"

This reverts commit 0e2b8d10c7ff55f6c21dea78db8fc23a98e68116.
defconfig: update and remove unused config