uboot-phytec

* Add variable CPU clock for MPC859/866 systems (so far only TQM866M):
  see doc/README.MPC866 for details;
  implement workaround for "SIU4" and "SIU9" silicon bugs on MPC866;
  calculate CPU clock frequency from PLL register values.

* Add support for 128 MB RAM on TQM8xxL/M modules