control: stop suggesting initramfs-tools

The use of initramfs-tools in forky is being phased out for dracut, so this suggestion is becoming obsolete. Suggesting an initramfs generator for every firmware package also do not seem to be a sensible solution, since some firmware can just be loaded when the root file system is mounted.

Remove the Suggest: initramfs-tools line in the generated binary packages to reflect this.

Closes: #1135736