powerpc: Fix preempt-lazy on 64bit
Schedule must not be invoked on a lazy-preempt request if preemption is
disabled. This regression was introduced in v5.9-rc2-rt1.
Check the preemption counter before looking at the lazy-preemption
counter and both have to be 0.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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