sched: Add missing trace points

sched_enq_deq_task, sched_cpu_util and sched_energy_diff
trace points are present in 4.9 kernel. These trace points
are not ported to 4.14 kernel. Add them now.

Change-Id: Ieec2e27486e2549d1a9d483a901500eb093ccfa4
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>