Remove duplicate symlinks

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>

netronome/flower/nic_AMDA0058-0011_4x10_1x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0058-0011_8x10.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0058-0012_1x100.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0058-0012_2x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0058-0012_4x10_1x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0058-0012_8x10.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0011_1x100.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0011_2x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0011_4x10_1x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0011_8x10.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0012_1x100.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0012_2x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0012_4x10_1x40.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0078-0012_8x10.nffw

-nic_AMDA0058.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0081-0001_1x40.nffw

-nic_AMDA0081.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0081-0001_4x10.nffw

-nic_AMDA0081.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0081.nffw

-nic_AMDA0097.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0096-0001_2x10.nffw

-nic_AMDA0096.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0097-0001_2x40.nffw

-nic_AMDA0097.nffw
\ No newline at end of file

netronome/flower/nic_AMDA0097-0001_4x10_1x40.nffw

-nic_AMDA0097.nffw
\ No newline at end of file