VbCheckDisplayKey: Remove easter egg support

We haven't used the easter egg screen since Mario. Time to get rid of
that code.

BRANCH=None
BUG=None
TEST=Booted Kevin.

Change-Id: I8f403f296ebb2a3d14ba6a70f12cd13a58e67b64
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1548303
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
2 files changed