A9M2440: Be able to configure things baseboard dependent ...

There is no really generic way to configure the S3C2440 CPU with fits to all
possible baseboards. This patch separates things into the CPU card related and
baseboard related things. This ensures to be able to configure things for
each possible baseboard without modifying/patching the main card source.

Signed-off-by: Juergen Beisert <juergen@kreuzholzen.de>