util: correct unpack_ftb
util: correct unpack_ftb

unpack_ftb is used as a build tool to convert
ST toucpad .ftb file to .bin

BUG=b:109719787
TEST=verify that unpack_ftb is present and executable

Change-Id: I91f541f7c030adc7979043ad48cdedc1f9f58da6
Reviewed-on: https://chromium-review.googlesource.com/1104979
Commit-Ready: Bob Moragues <f5049d5b5df4f96d121308a63d9e3c0dfa5ed2dc@chromium.org>
Tested-by: Bob Moragues <f5049d5b5df4f96d121308a63d9e3c0dfa5ed2dc@chromium.org>
Reviewed-by: Nick Sanders <f4566bb3c90c0bf5fa0906b296b1da45051a62ee@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec