buildroot

.gitlab-ci.yml: use large timeouts for runtime tests

Multiply the timeouts for emulator in the gitlab runners by 10 to avoid
sporadic failures in elastic runners.

Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>