The ovmf pacakge in bionic doesn't really work in our CI.
As a workaround we use the old package from xenial, but we can't keep
using it also in Ubuntu Focal.
This patch aims to convert the uefi jobs to use Ubuntu Focal as
base operating system and use the native ovmf package.
Story: 2007785
Task: 40025
Change-Id: I653e5da2672b14eae88c6cab923b8617432f1dc1
aac89c2149