To support affinity setting for non wake up external gpio interrupt, add
irq_set_affinity callback using irq number from pinctrl driver data.

Before this patch, changing the irq affinity of gpio interrupt is not
possible:

    # cat /proc/irq/418/smp_affinity
    3ff
    # echo 00f > /proc/irq/418/smp_affinity
    # cat /proc/irq/418/smp_affinity
    3ff
    # cat /proc/interrupts
               CPU0       CPU1       CPU2       CPU3    ...
    418:       3631          0          0          0    ...

With this patch applied, it's possible to change irq affinity of gpio
interrupt:

    # cat /proc/irq/418/smp_affinity
    3ff
    # echo 00f > /proc/irq/418/smp_affinity
    # cat /proc/irq/418/smp_affinity
    00f
    # cat /proc/interrupts
               CPU0       CPU1       CPU2       CPU3      ...
    418:       3893        201        181        188      ...
Signed-off-by: Youngmin Nam <youngmin.nam@samsung.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Tested-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20231126094618.2545116-1-youngmin.nam@samsung.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>