sched_tp: Add update_time to sched_pelt_cfs and sched_pelt_rq_template

The trace event sched_pelt_se already has this entry to trace PELT's
last_update_time.
Having this for cfs, rt, dl rq and irq as well is interesting to debug
PELT issues, especially with time-scaling (rq_clock_task/clock_pelt
diff and sync).

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>