sched, x86: Remove broken power estimation

The x86 sched power implementation has been broken forever and gets in
the way of other stuff, remove it.

For archaeological interest, fixing this code would require dealing with
the cross-cpu calling of these functions and more importantly, we need
to filter idle time out of the a/m-perf stuff because the ratio will go
down to 0 when idle, giving a 0 capacity which is not what we'd want.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-wjjwelpti8f8k7i1pdnzmdr8@git.kernel.org

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