bmpblk: add kukui board

uses the same configuration as flapjack

BUG=b:137725123,b:134461328
TEST=build and deploy on kukui, verify that 'sd card' not in the
recovery message
BRANCH=None

Change-Id: I8218c0262a9972ce6b81a63744f4c27e2766fbbf
Reviewed-on: https://chromium-review.googlesource.com/1707793
Tested-by: Ting Shen <phoenixshen@chromium.org>
Commit-Ready: Ting Shen <phoenixshen@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>