feat(cpus): add CI config for Cortex-X4

This patch adds a basic CI config that runs the cpu-extensions tftf
tests. Motivation behind adding this is to add a config to test
one of the cores affected by CVE-2024-7881.

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I9c80d10c359dd9f8754752f8756330cb88e07a91
1 file changed