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This will provide the user a place to drop firmware files needed by the
kernel.

In the future (compat level >= 10) we'll want to move
debian/tmpfiles/linux-firmware.conf to debian/linux-firmware.tmpfile, so
it will be automatically installed by dh_installinit, and we can drop
debian/linux-firmware.install.
Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com>

https://phabricator.endlessm.com/T12154