Earlier this week at the Mortgage Bankers Association annual convention in Las Vegas, FHFA director Mel Watt gave us some more detail about the upcoming Common Securitization Platform (CSP) that will be used by Fannie Mae / Federal National Mortgage Assctn Fnni Me (OTCBB:FNMA) and Freddie Mac / Federal Home Loan Mortgage Corp (OTCBB:FMCC), which raises questions about whether he really wants to wind down the GSEs. Remarks from Fannie Mae and Freddie Mac CEOs at the same convention also give the impression of agencies that intend to be around for a long time, as each outlined their vision for…