[PATCH 1/2][OF] Add of_device_is_disabled function

[David Miller]

From: Josh Boyer <jwboyer at linux.vnet.ibm.com>
Date: Sat, 23 Feb 2008 18:59:04 -0600

> Dave, I'm not sure how applicable this all is to sparc.  But for some
> of the "newer" embedded ports that are coming into powerpc I can see it
> being very useful.

I think I've seen this property on sparc boxes too, I'm fine
with whatever you guys come up with.