sched: duplicate scheduler files to bring back QHMP extensions

Duplicate the kernel/sched/core.c, kernel/sched/fair.c,
kernel/sched/sched.h and include/trace/events/sched.h
files to bring back the QHMP scheduler extensions.

The snapshot is taken as of the msm-3.18 kernel commit 86596aef
("sched: encourage idle load balance and discourage active load
balance").

Change-Id: I0a315c481f0635d839fe38eef19768ca983cdf04
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>