All 64-bit Book3E have E500=y, so drop the unneeded ifdefs.

Link: https://lkml.kernel.org/r/7fb88809c88a1b774063eda602a9333079403f83.1719928057.git.christophe.leroy@csgroup.euSigned-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>