[PATCH 1/5 v3] Add the explanation and a sample of RapidIO OF node to the document of booting-without-of.txt file.

[Zhang Wei-r63237]

Hi, Kumar, 
> +   RapidIO is a definition of a system interconnect. This node add
> > +   the support for RapidIO processor in kernel. The node name is
> > +   suggested to be 'rapidio'.
> > +
> > +   Required properties:
> > +
> > +    - compatible : Using "fsl,rapidio-delta" for Freescale PowerPC
> > +      RapidIO controller.
> > +    - #address-cells : Address representation for 
> "rapidio" devices.
> > +      This field represents the number of cells needed to represent
> > +      the RapidIO address of the registers.
> 
> Can you explain this a little further.  I'm a bit confused by  
> 'RapidIO address of the registers'.
> 
I want to present "This field represents the number of cells [needed to
represent the RapidIO address] of the registers."
Maybe I should remove 'of the registers' to be more clear.

Thanks!
-zw