EC-EFS: Copy dev keys from platform/ec

Currently, ec.bin generated by cros_sdk contains and is signed by the
dev keys in the platform/ec/<board> directory. This patch copies these
dev keys to vboot_reference.

BUG=b:73249665
BRANCH=none
TEST=make runtests

Change-Id: Id2a0b16dc6d404a6bea902fd5a401d6fc7caa2bf
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/940665
Reviewed-by: Wai-Hong Tam <waihong@google.com>
(cherry picked from commit 6164b22471a2d0dc26d875bc78036adf5fe706c8)
Reviewed-on: https://chromium-review.googlesource.com/946749
2 files changed