sched: Add some clock info to sched_debug

Add more clock information to /proc/sched_debug, Thomas wanted to see
the sched_clock_stable state.

Requested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc kernel/sched_clock.c
Simple merge

diff --cc kernel/sched_debug.c
Simple merge