sched/balancing: Rename load_balance() => sched_balance_rq()

sched/balancing: Rename load_balance() => sched_balance_rq()

Standardize scheduler load-balancing function names on the
sched_balance_() prefix.

Also load_balance() has become somewhat of a misnomer: historically
it was the first and primary load-balancing function that was called,
but with the introduction of sched domains, it's become a lower
layer function that balances runqueues.

Rename it to sched_balance_rq() accordingly.

Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Shrikanth Hegde <[email protected]>
Link: https://lore.kernel.org/r/[email protected]