Port this code to support RTL8720DN

[Dev-byte-source]

Hi,

Thanks for the amazing hardware and software with the prompt support.

I humbly want to suggest to add/support this code to be run on RTL8720DN. Devices using RTL8720DN do have 5GHz wifi which is not present on ESP32s. Devices like Seeed Studio WIO terminal have all the hardware but not htis amazing software.

Thanks in Advance.

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