MAINTAINERS: Drop separate pseries entry

[Michael Ellerman]

On Wed, 2016-05-10 at 05:04:00 UTC, Michael Ellerman wrote:
> Paul is no longer acting as a separate maintainer for pseries, it is
> handled along with the rest of powerpc. The URL no longer links anywhere
> meaningful, so drop it also.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/55099115ca523b5edf5c542bd5c328

cheers