time_bench_sample: Recording the effect of Non-PREEMPT-able kernel.

Previous results with disabled CONFIG_PREEMPT=n, had enabled
PREEMPT_COUNT=y, because I had enabled DEBUG_ATOMIC_SLEEP=y which
selected PREEMPT_COUNT even-though PREEMPT was disabled.

 DEBUG_ATOMIC_SLEEP == "Sleep inside atomic section checking"

True disabling of CONFIG_PREEMPT is very clear for the case of
preempt_{disable,enable} which is reduced from 4.291ns to
0.360ns, which is zero cost as this is the same as the loop cost.

The spin_lock measurement also got a bit faster. From 16.449 ns
to 13.946 => +2.503ns faster.

The qmempool and SLUB results also improved slightly.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>