Remove code for displaying screen from GBB

This patch removes the code displaying vboot screens using bitmap
and layout data stored in GBB. bmpblk_utility, and futility
support for BmpBlock is also removed.

BUG=chromium:622501,chrome-os-partner:54619,b:124141368
BRANCH=none
CQ-DEPEND=CL:373123
TEST=Verified screens on eve && emerge-eve chromeos-bootimage &&
make runtests

Change-Id: I1a8dd8ff0162965e81df121d5a87ea64310a0854
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/367882
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
29 files changed