Revert "Break the kabi"

This reverts commit 77d95ba.

Author: bmastbergen

include/linux/perf_event.h

@@ -691,7 +691,6 @@ struct perf_event {
 	int				event_caps;
 	/* The cumulative AND of all event_caps for events in this group. */
 	int				group_caps;
-	unsigned int			group_generation;
 
 	struct perf_event		*group_leader;
 	struct pmu			*pmu;
@@ -806,6 +805,7 @@ struct perf_event {
 #endif
 	struct list_head		sb_list;
 
+	RH_KABI_EXTEND(unsigned int	group_generation)
 #endif /* CONFIG_PERF_EVENTS */
 };