Add Waveshare PCIe to M.2 HATs with B-key

[dimitriblock]

There are two PCIe HATs from Waveshare with M.2 with a B-key. Such keying is mainly used for cellular 4G/5G modules. Could you add them to your awesome overview list?

Here are the links:

https://www.waveshare.com/rm520n-gl-5g-hat-plus.htm

https://www.waveshare.com/pcie-to-4g-5g-m.2-usb3.2-hat-plus.htm

By the way: Are there any other M.2 B-key HATS connected via PCIe?

Thanks for your valuable work