Remove empty names from generated sbom

[saba8814]

show-info walks TARGETS_ROOTFS, but the image and qemu targets set only _DIR. They come out nameless and land in the SBOM with an empty bom-ref, which CycloneDX 1.6 rejects. Set _NAME and _TYPE too, as fs/common.mk does for rootfs targets.

Description

Checklist

Tick relevant boxes, this PR is-a or has-a:

• Bugfix
  • Regression tests
  • ChangeLog updates (for next release)
• Feature
  • YANG model change => revision updated?
  • Regression tests added?
  • ChangeLog updates (for next release)
  • Documentation added?
• Test changes
  • Checked in changed Readme.adoc (make test-spec)
  • Added new test to group Readme.adoc and yaml file
• Code style update (formatting, renaming)
• Refactoring (please detail in commit messages)
• Build related changes
• Documentation content changes
  • ChangeLog updated (for major changes)
• Other (please describe):

[troglobit]

lgtm

[troglobit]

@saba8814 This change is very unlikely to affect the resulting image. So please "skip" the test runs on http://monza/styx/ and http://monza/alder/ when ghmoon picks them up as TODO jobs.

Tip

We can also set [skip ci] on changes like this. I'm also introducing a ci:skip label that can be added before/after fixing up, e.g., ChangeLog conflicts and jobs like this one. This will soon be available on main.