Rename all the packages containg the helper binaries
Remove potential confusion with shim-signed. We will now end up with shim-helpers-$arch-signed to make it clear that they just contain the helper binaries (fb.efi and mm.efi)
Remove potential confusion with shim-signed. We will now end up with shim-helpers-$arch-signed to make it clear that they just contain the helper binaries (fb.efi and mm.efi)