Add I2CFIFO primative support #48
Description
I am currently using the I2C hard IP on nexus devices for girlvoice. I would love to use prjoxide + nextpnr for place and route but support for the I2CFIFO primitive is still missing. My design is quite resource constrained and the I2C IP has been really helpful in saving space in my design. I would love to be able to ditch Radiant. Any plans to add this in the future?