[OLK-6.6] irqchip/gic-v3: Fix one race condition due to NMI withdraw

The introduce of FEAT_NMI/FEAT_GICv3_NMI will cause a race problem that
we may handle the normal interrupt in interrupt disabled context due to
the withdraw of NMI interrupt. The flow will be like below:

[interrupt disabled]
<- normal interrupt pending, for example timer interrupt
<- NMI occurs, ISR_EL1.nmi = 1
do_el1_interrupt()
<- NMI withdraw, ISR_EL1.nmi = 0
ISR_EL1.nmi = 0, not an NMI interrupt
gic_handle_irq()
__gic_handle_irq_from_irqson()
irqnr = gic_read_iar() <- Oops, ack and handle an normal interrupt
in interrupt disabled context!

Fix this by checking the interrupt status in __gic_handle_irq_from_irqson()
and ignore the interrupt if we're in interrupt disabled context.

Fixes: 0408b5bc4300 ("irqchip/gic-v3: Implement FEAT_GICv3_NMI support")

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