drm/i915/pmu: Fix sysfs exported counter config

We need to generate the event config value using the uAPI class and not
the driver internal one.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 109ec55 ("drm/i915/pmu: Only enumerate available counters in sysfs")
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180123134558.3222-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/i915_pmu.c

@@ -843,7 +843,7 @@ create_event_attributes(struct drm_i915_private *i915)
 			*attr_iter++ = &i915_iter->attr.attr;
 			i915_iter =
 				add_i915_attr(i915_iter, str,
-					      __I915_PMU_ENGINE(engine->class,
+					      __I915_PMU_ENGINE(engine->uabi_class,
 								engine->instance,
 								engine_events[i].sample));