(kernel-rolling) input: Add a new serio driver for Phytium PCI PS/2 controller

[MingcongBai]

Picked and rebased from #200.

From original pull request:

This driver supports Phytium PCI PS/2 controller.

Builds tested

• amd64
• arm64
• loong64

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关键摘要:

• 在phytium_ps2_irq函数中，scancode变量被声明但未使用，应该移除或使用。
• phytium_ps2_write函数中的val变量应该使用u8类型，因为只有一个8位的数据被写入设备。
• phytium_ps2_open和phytium_ps2_close函数中，ps2if变量的作用域应该是全局的，以避免在每次调用这些函数时都创建一个新的实例。
• phytium_pci_ps2_probe函数中的ps2if和serio的内存分配应该使用devm_kzalloc，而不是kzalloc，以确保正确的内存分配策略。
• phytium_pci_ps2_probe和phytium_pci_ps2_remove函数中，pdev和ps2if的引用计数没有增加，可能会导致在多线程环境中出现竞态条件。
• STAT_RX_COUNTER宏函数在phytium_ps2_data结构体中没有定义，应该在代码中找到并补全。
• phytium_pci_ps2_driver模块中缺少对phytium_pci_ps2_probe和phytium_pci_ps2_remove函数的文档说明。
• phytium_pci_ps2_ids数组中的{ PCI_VDEVICE(PHYTIUM, 0xdc34) }定义了一个无效的设备ID，应该检查PHYTIUM的设备ID格式是否正确。

是否建议立即修改:
是