Add symbol for FTDI FT4222HQ

This adds the FTDI FT4222HQ USB to Quad-SPI / I²C bridge.

Footprint PR: https://github.com/KiCad/kicad-footprints/pull/1786

---

All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the symbol(s) you are contributing
  • https://www.mouser.de/ds/2/163/DS_FT4222H-461024.pdf
  • https://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT4222H.pdf
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.