sign_official_build: Don't sign miniOS kernels in factory shims

Factory shims contain miniOS kernels, but they are not used, so don't
sign them. They will remain in the image signed with dev keys.

BRANCH=None
BUG=None
TEST=Run sign_official_build.sh on factory shim. Logs show miniOS
kernels are not signed, and shim still boots.

Change-Id: I4a1b72726edb7d780a3f2c2fe783f568a012ee77
Signed-off-by: Reka Norman <rekanorman@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/4321706
Tested-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Reka Norman <rekanorman@chromium.org>
1 file changed