igt/perf_pmu: Flush to idle after hang

We may not idle immediately after a hang, and indeed may send a pulse
down the pipeline periodically to become idle. Rather than make a flimsy
assumption about how long we need to sleep before the system idles,
wait for the system to declare itself idle; flushing it to idle in the
process!

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

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