GitLab

Upstream linux-firmware has removed all symlinks from the git
repo. The links are now created by copy-firmware.sh from Link:
entries in WHENCE. This means we need to use copy-firmware.sh
to install firmware in order to get symlinks.

Update copy-firmware.sh to also check WHENCE.ubuntu for files to
install. This requires using the -h option for grep to suppress
file names in the output.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>