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Now that the copy-firmware.sh script can create symlinks from the Link:
entries in the WHENCE file on the fly, remove the duplicate symlinks
from the filesystem.

One odd entry was intel/dsp_fw_cnl.bin which was listed both as symlink
and as a regular file. Both entries can be removed since the it's really
a symlink, so it will be recreated at installation time.

While at it, update the check_whence.py script to not look for the
existence of symlinks in the filesystem because they are created on the
fly at installation time by the copy_firmware.sh script.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>