gpio: tegra186: Support multiple interrupts per bank

Tegra194 and later support more than a single interrupt per bank. This
is primarily useful for virtualization but can also be helpful for more
fine-grained CPU affinity control. To keep things simple for now, route
all pins to the first interrupt.

For backwards-compatibility, support old device trees that specify only
one interrupt per bank by counting the interrupts at probe time.

Signed-off-by: Thierry Reding <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

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