igt/perf_pmu: Keep batch_duration_ns as the minimum measurement duration

We have chosen batch_duration_ns to be the minimum duration we need to
meet our accuracy requirements for legacy ringbuffer PMU sampling. As
such, we need to be careful to use multiples of it during tests, and not
split it into different phases within a test, like multi_client does.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

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