update_kernel: don't log about not copying firmware

We don't copy /lib/firmware by default now, so the messages here are
backward. Don't log anything if we're not doing anything.

BUG=none
TEST=none

Change-Id: Id7e12900c0779907c38791aac4e2f401a6d9296f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1552539
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
1 file changed