intel/pmu: Catch-up with i915 RC6 aggregation changes

Since i915 PMU is removing separate RC6 counters and now aggregates all
under a single one, catch up the test and intel-gpu-overlay with those
changes.

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