linux-firmware: fix hash for WHENCE license file

linux-firmware: fix hash for WHENCE license file

Commit 51435be1f1e8d4f7f50c95a406ecde6cb0e22418 ("linux-firmware: bump
version to latest 8d69bab") bumped the linux-firmware package, but
forgot to update the hash file accordingly for the license files.

Especially, the WHENCE file contains the list of all licenses for the
different firmware, so it gets updated pretty much whenever a new
firmware is added or a firmware is updated.

Update its hash to fix legal-info for the linux-firmware package, and
therefore fix:

  http://autobuild.buildroot.net/results/9795ac912d1bbe66386be9286f1703cdbe0a8898/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>