[patch] fix RTC/NVRAM accesses on Maple

[Segher Boessenkool]

>> Care to redo the patch?
>
> After some offline discussion, I think we're in agreement that these
> properties are fine, since Linux's device tree code can't handle
> multiple ranges. Right Segher?

Not fine, but good enough for now, will need more work elsewhere
before we can do "the right thing" here.

> Hollis Blanchard
> IBM Linux Technology Center
>
> Due to a firmware device tree bug, RTC and NVRAM accesses (including
> halt/reboot) on Maple have been broken since January, when an untested
> build fix went in. This code patches the device tree in Linux.
>
> Signed-off-by: Hollis Blanchard <hollisb at us.ibm.com>
Signed-off-by: Segher Boessenkool <segher at kernel.crashing.org>