INTx: phytium: Add Phytium INTx driver support

[tianwei08222]

Driver for Phytium PCIe legacy INTx interrupt controller.

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关键摘要:

• 在phytium_ixic_irq_eoi函数中，WARN_ON(intx >= NUM_IRQS);可能不会触发，因为intx在0到3之间。应该添加对intx的检查，确保它不会大于等于NUM_IRQS。
• phytium_ixic_irq_alloc函数中的WARN_ON(nr_irqs != 1);可能会在nr_irqs不为1时触发，但nr_irqs的值在0到4之间，所以这个检查可能是多余的。
• ioremap在打开maps时可能会失败，没有检查返回值，应该添加对ioremap返回值的检查。
• of_address_to_resource函数的错误处理没有实现，如果解析资源失败，应该返回错误代码。
• phytium_ixic_dt_init函数中的out_unmap块中没有处理iounmap的返回值，如果iounmap失败了，内存可能会泄漏。
• phytium_ixic_acpi_probe函数中的out_unmap块中没有处理iounmap的返回值，如果iounmap失败了，内存可能会泄漏。

是否建议立即修改:
是