ep5200 BSP renamed

[Joel Sherrill]

Hi,

I have renamed the ep5200 BSP variant of
the gen5200 BSP to icecube.  Icecube
is the cute name for the Freescale LITE5200
Evaluation board that the ep5200 is a clone of.

I have confirmed that the icecube BSP
runs on the LITE5200 board although I
have not completed tested.

It just seemed silly for it to be named after
a clone you can no longer buy when the original
is still available.

--joel