arm64: Use the correct aff in up_affinity_irq function

[zyfeier]

Summary

Fixed spi affinity fail issuue, set the correct aff in irouter register.

Impact

arm64 gicv3

Testing

fvp-armv8r:nsh_smp spi test case:

irq_attach(i, irq_test_isr, NULL);
up_enable_irq(i);
up_affinity_irq(i, cpuset);
up_trigger_irq(i, cpuset);