ANDROID: sched/fair: Sync task util for strf hook

The vendor hook in select_task_rq_fair() currently sees a potentially
stale task utilization. Make sure to sync it beforehand to avoid any
issues.

Fixes: a1fc1fba ("ANDROID: sched: add restrict vendor hook to modify task placement policy in EAS")
Signed-off-by: Quentin Perret <qperret@google.com>
Change-Id: I7675ce9fd37b160f8a7ba9651ae73b69a16d6d12
(cherry picked from commit c7ba09ce)