sched/core_ctl: Don't call core_ctl_check from scheduler tick

The WALT IRQ work calls core_ctl_check() when window is rolled
over. This is sufficient to update the core_ctl stats.

Currently core_ctl_check() is called from every CPU from the
the scheduler tickpath. Don't do this.

Change-Id: I2e6604e32489e866498d1ddca63ee3a412eac0f9
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>