(kernel-rolling) INTx: phytium: Add Phytium INTx driver support

[MingcongBai]

Picked and rebased from #188.

From original pull request:

Driver for Phytium PCIe legacy INTx interrupt controller.

Builds tested

• amd64
• arm64
• loong64

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关键摘要:

• 在phytium_ixic_irq_eoi函数中，WARN_ON(intx >= NUM_IRQS)和WARN_ON(nr_irqs != 1)应该被替换为更具体的错误信息，以便于调试。
• phytium_ixic_translate函数中的if (is_of_node(fwspec->fwnode))检查可能不准确，因为fwspec->fwnode可能不是of_node类型。
• phytium_ixic_alloc函数中的WARN_ON(nr_irqs != 1)检查可能不准确，因为nr_irqs可能不是1。
• phytium_ixic_init函数中的of_address_to_resource函数调用可能会导致内存泄漏，因为如果解析资源失败，ctr和hpb资源没有被正确释放。
• phytium_ixic_dt_init函数中的iounmap调用应该在irq_domain_add_hierarchy成功后立即调用，以避免潜在的内存泄漏。
• phytium_ixic_acpi_probe函数中的iounmap调用应该在acpi_irq_create_hierarchy成功后立即调用，以避免潜在的内存泄漏。
• phytium_ixic_driver模块的builtin_platform_driver调用可能不适用于所有情况，应该考虑使用platform_driver宏。

是否建议立即修改:
是