[U-Boot] spd_dram.c for mpc83xx broken

The spd code for mpc83xx is so broken it isn't funny. This is what I had to do to get my Micron MT47H64M16-3. This isn't against current u-boot, but it is a start.

Jocke

PS. Sorry for the attachment, trying to use Lotus Notes as my new E-mail client and I can't find how to insert a file :(