Net: Remove all hardcoded MAC addresses from default environments ...

While very convenient during debugging having MAC addresses in default
environments is a very bad idea. Stop it!

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

[m68k] Add Freescale Coldfire V4E Architecture support ...

- Added m68k vector, exception & interrupt handlers
- Added m68k macros to access m68k movec registers
- Added Coldfire support code (MultiChannelDMA)
- Added board support for phytec phyCore-MCF baseboard
- Added board support for konzeptpark MCB2 prototype

Signed-off-by: Carsten Schlote <schlote@vahanus.net>