drm/i915/pmu: drop kernel-doc

The comments are closer to not being kernel-doc.

drivers/gpu/drm/i915/i915_pmu.h:21: warning: cannot understand function prototype: 'enum i915_pmu_tracked_events '
drivers/gpu/drm/i915/i915_pmu.h:32: warning: cannot understand function prototype: 'enum '
drivers/gpu/drm/i915/i915_pmu.h:41: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * How many different events we track in the global PMU mask.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/7656b8f58b088c108a2a32f7089329740efabba1.1683041799.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_pmu.h

@@ -14,7 +14,7 @@
 
 struct drm_i915_private;
 
-/**
+/*
  * Non-engine events that we need to track enabled-disabled transition and
  * current state.
  */
@@ -25,7 +25,7 @@ enum i915_pmu_tracked_events {
 	__I915_PMU_TRACKED_EVENT_COUNT, /* count marker */
 };
 
-/**
+/*
  * Slots used from the sampling timer (non-engine events) with some extras for
  * convenience.
  */
@@ -37,7 +37,7 @@ enum {
 	__I915_NUM_PMU_SAMPLERS
 };
 
-/**
+/*
  * How many different events we track in the global PMU mask.
  *
  * It is also used to know to needed number of event reference counters.