sched/core: Remove unused rq::last_load_update_tick

sched/core: Remove unused rq::last_load_update_tick

The following commit:

  5e83eafbfd3b ("sched/fair: Remove the rq->cpu_load[] update code")

eliminated the last use case for rq->last_load_update_tick, so remove
the field as well.

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/1584710495-308969-1-git-send-email-vincent.donnefort@arm.com