sched/psi: Remove NR_ONCPU task accounting

We put all fields updated by the scheduler in the first cacheline of
struct psi_group_cpu for performance.

Since we want add another PSI_IRQ_FULL to track IRQ/SOFTIRQ pressure,
we need to reclaim space first. This patch remove NR_ONCPU task accounting
in struct psi_group_cpu, use one bit in state_mask to track instead.

Signed-off-by: Johannes Weiner <[email protected]>
Signed-off-by: Chengming Zhou <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Chengming Zhou <[email protected]>
Tested-by: Chengming Zhou <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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