image_signing: Add one more cheets flavor.

On Pi, the target name is sdk_cheets instead of sdk_google_cheets

BUG=chromium:1057649
TEST=./sign_android_unittests.sh
BRANCH=none
Change-Id: Ic4e5123687eee7fc9f6c0640b7b9455f180dff6e
Signed-off-by: Lepton Wu <lepton@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2083836
Reviewed-by: Nicolas Norvez <norvez@chromium.org>
Reviewed-by: George Engelbrecht <engeg@google.com>
2 files changed