sched/fair: trace energy_diff for non boosted tasks

In systems where SchedTune is enabled, we do not report energy diff for non
boosted tasks. Let's fix this by always genereting an energy_diff event where
however:
  nrg.delta = 0, since we skip energy normalization
  payoff = nrg.diff, since the payoff is defined just by the energy difference

Change-Id: I9a11ec19b6f56da04147f5ae5b47daf1dd180445
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
Signed-off-by: Chris Redpath <chris.redpath@arm.com>

Author: derkling

kernel/sched/fair.c

@@ -5702,8 +5702,14 @@ energy_diff(struct energy_env *eenv)
 	__energy_diff(eenv);
 
 	/* Return energy diff when boost margin is 0 */
-	if (boost == 0)
+	if (boost == 0) {
+		trace_sched_energy_diff(eenv->task,
+				eenv->src_cpu, eenv->dst_cpu, eenv->util_delta,
+				eenv->nrg.before, eenv->nrg.after, eenv->nrg.diff,
+				eenv->cap.before, eenv->cap.after, eenv->cap.delta,
+				0, -eenv->nrg.diff);
 		return eenv->nrg.diff;
+	}
 
 	/* Compute normalized energy diff */
 	nrg_delta = normalize_energy(eenv->nrg.diff);