When we fail to download the kernel image (for example when the
user pressed ctrl-c) do not try to boot the image

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

- 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>