ADHD: Add missing 'board-tegra2.h' file.
ADHD: Add missing 'board-tegra2.h' file.

Details

  Buildbots are failing because they are building in ways I didn't know.

  This adds a file that is required for the buildbots to succeed in
  building the ADHD package.

BUG=none
TEST=Let buildbot build.
Signed-off-by: Taylor Hutt <thutt@chromium.org>

Change-Id: If234bba9f68cf76d112cde312ff0682657c130e2

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd