genirq: Allow architectures to override set_handle_irq() fallback

Some architectures want to provide the generic set_handle_irq() API, but
for structural reasons need to provide their own implementation. For
example, arm64 needs to do this to provide uniform set_handle_irq() and
set_handle_fiq() registration functions.

Make this possible by allowing architectures to provide their own
implementation of set_handle_irq when CONFIG_GENERIC_IRQ_MULTI_HANDLER
is not selected.

Signed-off-by: Marc Zyngier <[email protected]>
[Mark: expand commit message]
Signed-off-by: Mark Rutland <[email protected]>
Tested-by: Hector Martin <[email protected]>
Cc: James Morse <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

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