sched: Add cpus_share_resources API

Add cpus_share_resources() API. This is the preparation for the
optimization of select_idle_cpu() on platforms with cluster scheduler
level.

On a machine with clusters cpus_share_resources() will test whether
two cpus are within the same cluster. On a non-cluster machine it
will behaves the same as cpus_share_cache(). So we use "resources"
here for cache resources.

Signed-off-by: Barry Song <[email protected]>
Signed-off-by: Yicong Yang <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Gautham R. Shenoy <[email protected]>
Reviewed-by: Tim Chen <[email protected]>
Reviewed-by: Vincent Guittot <[email protected]>
Tested-and-reviewed-by: Chen Yu <[email protected]>
Tested-by: K Prateek Nayak <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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