tests/perf_pmu: Use absolute tolerance in accuracy tests

We need to use absolute tolerance when asserting on percentages. Relative
tolerance in this case is unfair and inaccurate since it's strictness
varies with relative target busyness.

v2:
 * Do not include spin batch edit and submit into measured time.
 * Open PMU before child is in test PWM phase.
 * No need to emit test PWM for twice as long with the new explicit
   synchroniazation via pipe.
 * Log test duration in ms for better readability.
 * Drop inverse assert. (Chris Wilson)

v3: Explain tasklet delay. (Chris Wilson)

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

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