UsbMapping has more work than needed

**Guide**: OpenCore Post Install Guide ([link](https://dortania.github.io/OpenCore-Post-Install/usb/manual/manual.html#determining-the-properties))

The suggested path looks weird and overcomplicated.

- `IOProviderClass` is unused, as it is not the property you match on but the property you expose. Therefore it can be pretty much anything. Making the user find it is unnecessary, just hardcode to e.g. `AppleUSBXHCIPCI`, but really whatever value will do.
- `IOPathMatch` can be used, but in most cases it is enough to just use `IONameMatch` and the device name (as long the device name is unique), which is a lot shorter. E.g. I use `IONameMatch` → `XHCI`.