Use kmsg for LAVA test signals
We've seen a number of issues caused by random kernel messages interrupting LAVA test case signals. For example: https://lava.ciplatform.org/scheduler/job/1859#L648
Using kmsg helps avoid this issue as the test signals cannot be interrupted.
LAVA documentation: https://lava.ciplatform.org/static/docs/v2/test-repositories.html#using-kernel-messages-in-a-test-shell
Signed-off-by: Chris Paterson chris.paterson2@renesas.com