irq: Allow interrupts to routed to NMI (or similar)

Some combinations of architectures and interrupt controllers make it
possible for abitrary interrupt signals to be selectively made immune to
masking by local_irq_disable(). For example, on ARM platforms, many
interrupt controllers allow interrupts to be routed to FIQ rather than IRQ.

These features could be exploited to implement debug and tracing features
that can be implemented using NMI on x86 platforms (perf, hard lockup,
kgdb).

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

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