travis: give every job a name

Travis CI now supports giving jobs an explicit name. Do this for all jobs.
This allows more direct control over jobs names than the previous
automatic or implicit naming based on the environment variables or script
text.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
[trini: Update names for jobs added/changed since posting]
Signed-off-by: Tom Rini <trini@konsulko.com>