linux-firmware: add LICENSE_FILES and LICENSE file handling
The firmware blobs have all different licenses from the different
manufacturers of the binary blobs. This information is contained in the
upstream 'linux-firmware' repositroy.
This commit extends the package handling so that this information can be
added as an additional argument during packages generation.
Signed-off-by: Florian Eckert <[email protected]>
Florian Eckert