DO_NOT_MERGE dt-bindings: add foobar vendor-prefix

Add prefix for an example SoC vendor whose designs include controllers
that implement CBQRI.

Co-developed-by: Adrien Ricciardi <aricciardi@baylibre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@baylibre.com>
Signed-off-by: Drew Fustini <dfustini@baylibre.com>