enable watchdog support for all MPC824x boards that have a watchdog

* On MPC5200, restrict FEC to a maximum of 10 Mbps to work around the
  "Non-octet Aligned Frame" errors we see at 100 Mbps

* Patch by Sharad Gupta, 14 Sep 2003:
  fix SPR numbers for upper BAT register ([ID]BAT[4-7][UL])