image_signing: remove firmware_boot.sh

This script was added in CL:2618.

There's no references to it, and I can't find any evidence to it being
documented anywhere or anyone using it.

Let's remove it to see if anyone uses it.

BUG=chromium:1083510
BRANCH=none
TEST=emerge vboot_reference

Change-Id: I6c307d3b9f7ee4c12153baf5fcd97c98badefe7b
Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2212646
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed