Initial version of LAVA support

Release early and often, so here we go: - Changes in the Dockerfile to install dependencies - script folder still used (fixme) - Add fuego-lava-target-setup helper script - Add fuego-lava-target-teardown helper script - Add board template files - Add README.LAVA

Signed-off-by: Jan-Simon Moeller jsmoeller@linuxfoundation.org