ci: Disable pm_runtime and max clocks in LAVA jobs

To get more consistent performance and results, use the performance
devfreq governor and disable PM runtime.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <!7011>
82 jobs for !7011 with ci-bifrost in 70 minutes and 27 seconds (queued for 5 seconds)
merge request