core/Makefile: Add dist-for-goals calls for desktop image.

The desktop image is being built but not appearing in the artifacts.
Add dist-for-goals calls to make them show up in the builder
artifact lists.

Bug: b:349581445
Test: m, manual
Flag: EXEMPT desktop-only tooling
Change-Id: I015dc28871173376c1877e368ea423c9991e1aaf