adding first clean mx27 only fec driver

integrating sha's changes into jbe's branch

- Implement tree structure for devices ...

- Use device tree structure to implement partitions
- Let devinfo print a nice tree
- Introduce 'fixed' partitions which are not removable
- Fix mount: It was not possible to mount on a relative path.

correct RAM and Flash size for pcm028 board

beginning phycore pcm038 i.MX27 support