u-boot: fake support for new vboot APIs

We added some functions to vboot to prevent a
"surreptitious switch to developer mode" attack.
We need to support them here too, to the extent
that we don't break the compilation or the existing
behavior.

BUG=chrome-os-partner:21729
TEST=emerged parrot
BRANCH=none
Signed-off-by: Luigi Semenzato <semenzato@chromium.org>
CQ-DEPEND=CL:182420,CL:182241,CL:182357

Change-Id: I7f21ad7215312d4629e81e8afc1c9d4970de91b9
Reviewed-on: https://chromium-review.googlesource.com/182982
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Commit-Queue: Luigi Semenzato <semenzato@chromium.org>
Tested-by: Luigi Semenzato <semenzato@chromium.org>
3 files changed