mailbox: Add support for Phytium SoC mailbox driver

[hhhui-L]

Add the driver to support Phytium SoC mailbox controller.

[deepin-ci-robot]

Hi @hhhui-L. Thanks for your PR.

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[opsiff]

/ok-to-test
/lgtm

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在phytium_mbox_send_data函数中，mlink结构体的使用可能不正确，因为它没有在函数参数中传递。
• phytium_mbox_startup和phytium_mbox_shutdown函数中，对mlink的访问应该使用iomem_read或iomem_write来确保正确的内存访问。
• phytium_mbox_last_tx_done函数中，对mlink的访问应该使用iomem_read来确保正确的内存访问。
• phytium_mbox_probe函数中，对mbox的访问应该使用devm_kzalloc来确保正确的内存分配。
• phytium_mbox_remove函数中，对mbox的访问应该使用platform_get_drvdata来确保正确的平台驱动数据访问。
• phytium_mbox_driver结构体中的of_match_table和acpi_match_table应该使用of_match和acpi_device_id类型来定义。
• 缺少对phytium_mbox_ops结构体的定义，这可能是一个遗漏。
• 代码中没有对INTR_STAT和INTR_SET寄存器的访问进行错误检查，这可能会导致未定义行为。

是否建议立即修改:
是

[deepin-ci-robot]

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