irqdomain: Always associate interrupts for legacy domains

The unification of irq_domain_create_legacy() missed the fact that
interrupts must be associated even when the Linux interrupt number provided
in the first_irq argument is 0.

This breaks all call sites of irq_domain_create_legacy() which supply 0 as
the first_irq argument.

Enforce the association for legacy domains in __irq_domain_instantiate() to
cure this.

[ tglx: Massaged it slightly. ]

Fixes: 70114e7f7585 ("irqdomain: Simplify simple and legacy domain creation")
Reported-by: Jiaxun Yang <[email protected]>
Signed-off-by Matti Vaittinen <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Jiaxun Yang <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

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