(kernel-rolling) Phytium Random Number Generator support

[MingcongBai]

Picked and rebased from #149.

From original pull request:

This driver provides kernel-side support for the Random Number Generator hardware found on Phytium SoCs.

Builds tested

• amd64
• arm64
• loong64

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关键摘要:

• 在phytium_rng_read函数中，使用readl_poll_timeout可能导致资源泄露，如果readl函数在第一次检查时返回EAGAIN或EWOULDBLOCK，后续的轮询将不会执行，从而导致超时。
• phytium_rng_read函数中的max变量应该是size_t类型，以匹配read函数的参数类型。
• phytium_rng_read函数中缺少对read返回值的检查，可能会导致数据损坏。
• phytium_rng_cleanup函数中没有对iomem区域进行释放的操作，可能会导致内存泄露。
• module_param函数的使用应该在模块加载时进行，而不是在__init__函数中。
• phytium_rng_init和phytium_rng_cleanup函数中使用了container_of，但没有对rng结构体的Ptr是否有效进行检查。

是否建议立即修改:
是