Since the heartbeat may cause a preemption event, disable it over the
preemption suppression tests.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200615165013.22973-1-chris@chris-wilson.co.uk