sign_official_build: accept arcvm/bertha image

BUG=b:161828692
TEST=sign_official_build.sh base recovery_image.bin mykey signed.bin
TEST=sign_android_unittests.sh
BRANCH=none

Signed-off-by: Victor Hsieh <victorhsieh@chromium.org>
Change-Id: I158cd0c23198ffe8773b5882ba214b3ca4d26cae
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2310758
Reviewed-by: Mike Frysinger <vapier@chromium.org>
4 files changed