community/brillo: fix license
As clarified in ef7a335ca56:
Code forges like GitLab and GitHub have been defaulting to LICENSE.0BSD, even though a notable portion of the code is GPL-3.0-only and thus the resulting brillo binary is effectively GPL3.
Hopefully clarify that the 0BSD license is just provided for the portions of the code that are 0BSD.
https://gitlab.com/cameronnemo/brillo/-/commit/ef7a335ca56aeef525c02724bde783c1b3e50599