lava-templates: Provide job name differentiation for Juno devices

Currently, all jobs are lumped under the same name, "tf-juno", which makes
it very hard to track/review/follow jobs. This issue was resolved long ago
for FVP, so follow the same naming patterns here.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I1bc74b0944f3cb2e8e946dfb936e65007bb0e2c9
2 files changed