rq_stats: add run queue statistic collection to kernel tick scheduler

adapted from CAF reference for OMAP2 Platform

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/mach-omap2/Makefile
	kernel/time/tick-sched.c

Conflicts:
	arch/arm/mach-omap2/omap2plus-cpufreq.c

Conflicts:
	arch/arm/mach-omap2/Kconfig

Conflicts:
	arch/arm/mach-omap2/Makefile