[PATCH] ppc64: remove rma_top limit

[Sourabh Jain]

Hello Coiby,

> Hi,
>
> I'm curious to ask which bug this patch is going to fix. I tested it
> yesterday and it doesn't fix
> https://bugzilla.redhat.com/show_bug.cgi?id=2126409.

This patch doesn't fix the above bug, instead it enables kexec tool
to look for memory holes for kexec segments beyond 768MB (an arbitrary 
limit).

It is helpful for the case where the segments could not accommodated below
768MB due to bigger kernel/initrd/FDT size.

Thanks,
Sourabh Jain