efi: drop -signed subpackages

We chose to provide methods to sign packages but to avoid
signing these by default (with some arbitrary test keys)
the signatures are being added *after* the build by means
of rpmrebuild-pesign; all of this is made significantly
more complicated if there are separate -signed subpackages.

So these are being dropped in the packages; account for that.
1.0.2-alt0.M70T.1

- backported adaptations to handle EFI signed binaries the current way
gear-store-tags