ARM arch subdir cleanups

[Rafal Jaworowski]

M. Warner Losh wrote:
> : 
> : I just committed your patches. Yes, this kind of work is very welcome.
> 
> Indeed.  I've done some work trying to get obio abstracted out across
> all architectures.
> 

Are your OBIO cleanups available somewhere? Are you going to finish these (so
as not to overlap the work...)?

> The other thing that I'd like to see is a better defined board/cpu
> initialization sequence.  Or to make better use of the one that's
> defined now and document it better.  I made some bad choices, in
> hindsight, for the at91rm9200 port that are only now becoming
> apparent.
> 

Yes, this is a valid point. As we already talked I keep this in mind while
fleshing out the Orion port, but it'll make more sense for me to return to
such refactoring in a second spin, after we have basic functionality in operation.

Rafal