mcf52x2 change baudrate

Hello,

if you are use LOADS, LOADB or set baudrate on mcf52x2 boards the changing of baudrate never works. This patch fixed the problem.

CHANGELOG

* Fix: stops receiver and transmitter before changing the baudrate
* restarts receiver and transmitter after changing the baudrate register
* Fix: use gd->baudrate instead of gd->bd->bi_baudrate in serial_setbrg(void)

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