Jammy: use the provided clang

TF-a has a minimum clang version of 14 and Jammy provides it. Since
Ubuntu is not stuck on ancient versions of clang and we don't need the
bleeding edge, it would be easier to manage with the system provided
ones. This should also speed up ubuntu version upgrades.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: Iec710b5fbfca024b1aa6b52f97e4acc869d945a6
2 files changed