Ebon Upton [0], one of the main folk from the Raspberry Pi foundation works for Broadcom and does SoC. So odds are slim considering that connection probably enabled them to get extreme price arrangements otherwise not doable.
His Broadcom relationship is probably much less relevant now that the foundation has some money in the bank and a product that has achieved wide spread success.
[0] http://en.m.wikipedia.org/wiki/Raspberry_Pi_Foundation