Broadcom component library for Eagle circuit design software?
I think this is as close as we get to an answer for now. Broadcom chips are not released to the public with footprints and pinout. I, however, am fascinated in trying to get something workable. I looked up pdf to gerber converters, as it is popular and found this...
http://swannman.github.io/pdf2gerb/

I am not in the mood to install perl on my Windows machine right now, but if someone wants to give it a shot, they can get gerbers for the top layer. Try taking some pics of the top layer, converting to pdf and running them through...
http://elinux.org/RPi_BCM2835_Pinout
https://www.raspberrypi.org/blog/final-pcb-artwork/

This is the first step. If someone gets a clean gerber, then you can use relative distances from measurements on a Pi board to get the gerber spacing. Do this yourself or send me a clean gerber. With all of this, it would be possible to create a proper BGA footprint with decent pin pitches.

With the work done on the previously linked Linux page (thanks @FunkGuy), we might have something here.