PERFORCE change 174731 for review

[Nathan Whitehorn]

Rafal Jaworowski wrote:
> http://p4web.freebsd.org/chv.cgi?CH=174731
>
> Change 174731 by raj at raj_fdt on 2010/02/15 17:53:15
>
> 	Refactor and optimize FDT infrastructure.
> 	
> 	- Extend 'compatible'-related routines so that we can do strict
> 	  checking i.e. if a node is only compatible with a single entry. This
> 	  is required for nodes like 'simple-bus' as sometimes other nodes
> 	  claim their compatibility and we need to have a way to identify such
> 	  cases.
> 	
These 'compatible' routines would be very useful in the regular OF case 
as well. Any change you could move them into ofw/openfirm?
-Nathan