travis: Set build name so it appears in the web interfaces.
travis: Set build name so it appears in the web interfaces.

The env NAME="foo" syntax doesn't appear to set the name in the Travis web
interface.  Instead use the syntax from the docs:

 https://docs.travis-ci.com/user/build-stages/#naming-your-jobs-within-build-stages

Change-Id: Id0dcfcd5461c5bf842185ba845ed2248a599cd2a

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython