lava: Fix the internal armhf image name

The name of the internal images has changed and the LAVA job was getting error 404 when trying to retrieve it.

Broken: apertis_18.06-development-armhf-mx6qsabrelite_18.06.0.img.bmap Correct: apertis_18.06-development-armhf-internal-mx6qsabrelite_18.06.0.img.bmap

See https://lava.collabora.co.uk/scheduler/job/1196839

Signed-off-by: Emanuele Aina emanuele.aina@collabora.com