[POWERPC] 86xx: Cleaned up platform dts files

[Jon Loeliger]

So, like, the other day Kumar Gala mumbled:
> * Removed explicit linux,phandle usage. Use references and labels now
> * Removed interrupts property from openpic node
> * Removed interrupt-parent property from openpic node that pointed to itself
> 
> Signed-off-by: Kumar Gala <galak at kernel.crashing.org>

Sweet.

Acked-by: Jon Loeliger <jdl at freescale.com>

Thanks,
jdl