Update to Ubuntu Focal, 11.17/21 FVP image

Docker image built for Hafnium is now based on Ubuntu 20.04, image name
updated accordingly. This allows for FVP 11.17/21 FVP models to be used.

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: I3d643cb75539604373b2cd70b4e51fb67f1e96f6
2 files changed