TF-M: Adds LLVM Clang toolchain

LLVM Clang v18.1.3 added to jammy-amd64-tf-m-build

Change-Id: I8b9fac52979dd5917fd4b4454fe892e411acdd71
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
3 files changed