FVP: Limit test time to 10 min

Limit test time on FVP to 10 min, in case that TF-M drops into an
infinite test loop. This helps to avoid a failed image keeps
occupying FVP resources in LAVA and get other normal tests blocked.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I84bfa890a1d8fa1935b45df02eba80c1f22e5cac
2 files changed