image_signing: remove unpack_firmwarefd.sh script
image_signing: remove unpack_firmwarefd.sh script

Looks like an old script from Mario.  Won't run on modern chromebooks
anyway.

Not installed on any devices.

BUG=chromium:1084003,chromium:1085310
BRANCH=none
TEST=emerge vboot_reference

Signed-off-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Change-Id: I4b68183bc9bc943f273630cf12c52801a74df5be
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2210762
Reviewed-by: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Reviewed-by: Hung-Te Lin <8a7fce4940baad93a69f5073b383c85deed9d9c4@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot