[PATCH] Remove CPU_FTR_NEED_COHERENT for 7448.

[Jon Loeliger]

So, like, the other day Paul Mackerras mumbled:
> Jon Loeliger writes:
> 
> > Yes.  We have the data to back this claim up.
> 
> Care to share it with us? :)

To quote our very own Olof Johansson:

    Not at this time, sorry.

jdl