DEBUG: sched/fair: Fix missing sched_load_avg_cpu events

update_cfs_rq_load_avg is called from update_blocked_averages without triggering
the sched_load_avg_cpu event. Move the event trigger to inside
update_cfs_rq_load_avg to avoid this missing event.

Change-Id: I6c4f66f687a644e4e7f798db122d28a8f5919b7b
Signed-off-by: Brendan Jackman <brendan.jackman@arm.com>
(cherry picked from commit 7f18f0963d81a096e741cfc14ec9c2915f633e0a)
(cherry picked from commit 998d092b3385f1e62fa5cb5f491c7c633a4bbc3e)
Signed-off-by: Quentin Perret <quentin.perret@arm.com>