Hints for alsa-firmware-loaders in contrib

Warnings

• asv-cid-rdns-contains-hyphen
  alsa-firmware-loaders.metainfo.xml:3 - org.alsa-project.alsa-firmware-loaders
  The component ID contains a hyphen/minus in its domain part. Using a hyphen is strongly discouraged to improve interoperability with other tools such as D-Bus. A good option is to replace any hyphens with underscores (`_`). Hyphens are only allowed in the last segment of a component ID.
• asv-url-homepage-missing
  alsa-firmware-loaders.metainfo.xml -
  This component is missing an `url` element of type `homepage` to link to the project's homepage.