sched/numa: Use runnable_avg to classify node

Use runnable_avg to classify numa node state similarly to what is done for
normal load balancer. This helps to ensure that numa and normal balancers
use the same view of the state of the system.

Large arm64system: 2 nodes / 224 CPUs:

  hackbench -l (256000/#grp) -g #grp

  grp    tip/sched/core         +patchset              improvement
  1      14,008(+/- 4,99 %)     13,800(+/- 3.88 %)     1,48 %
  4       4,340(+/- 5.35 %)      4.283(+/- 4.85 %)     1,33 %
  16      3,357(+/- 0.55 %)      3.359(+/- 0.54 %)    -0,06 %
  32      3,050(+/- 0.94 %)      3.039(+/- 1,06 %)     0,38 %
  64      2.968(+/- 1,85 %)      3.006(+/- 2.92 %)    -1.27 %
  128     3,290(+/-12.61 %)      3,108(+/- 5.97 %)     5.51 %
  256     3.235(+/- 3.95 %)      3,188(+/- 2.83 %)     1.45 %

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Mel Gorman <mgorman@suse.de>
Link: https://lkml.kernel.org/r/20200921072959.16317-1-vincent.guittot@linaro.org