Build dump_fmap into futility.

This stops creating dump_fmap as a standalone utility and builds it into
futility. Since it was already invoked as a symlink, no user-visible changes
should be observed.

BUG=chromium:224734
BRANCH=none
TEST=manual, trybots

  sudo FEATURES=test emerge vboot_reference
  FEATURES=test emerge-$BOARD vboot_reference

Change-Id: I68d1bea0c1867043b2633e15509b95c2717009a7
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/47672
Reviewed-by: Randall Spangler <rspangler@chromium.org>
9 files changed