sched/fair: Rework sched_use_asym_prio() and sched_asym_prefer()

sched_use_asym_prio() and sched_asym_prefer() are used together in various
places. Consolidate them into a single function sched_asym().

The existing sched_asym() function is only used when collecting statistics
of a scheduling group. Rename it as sched_group_asym(), and remove the
obsolete function description.

This makes the code easier to read. No functional changes.

Signed-off-by: Alex Shi <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Tested-by: Ricardo Neri <[email protected]>
Reviewed-by: Ricardo Neri <[email protected]>
Reviewed-by: Vincent Guittot <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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