When loading something with UEFI LoadImage, signature validation is performed. However, we verify the kernel by its hash already, and don't want to sign it. Hence, we have to load it on our own.
Lanzatool is renamed to 'tool' and lanzaboote is renamed to 'stub'. The name of the lanzatool binary is now 'lzbt' standing for LanZaBooteTool.
This commit only moves the directories instead of chaning any names inside files.