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The current make-install procedure leaves lots of garbage files that
aren't really firmware files in /lib/firmware.

Instead of copy-all-and-prune approach, copy only the listed files and
links in WHENCE by make-install for assuring only the proper firmware
files.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>