sched: Add controls for sched features

* Currently we provide users attributes to enable/
  disable GENTLE_FAIR_SLEEPERS and ARCH_POWER
* This patch uses already implemented GFS structure
  to add ARCH_POWER attribute.
* Attributes can be found under /sys/kernel/sched/*

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
sched: cpu_power: disable at boot
vfp: makefile update build flags neon + hard float