powerpc/kdump: Remove ppc_md.machine_crash_shutdown

No one uses ppc_md.machine_crash_shutdown, so remove it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/pseries/kexec.c

@@ -66,7 +66,6 @@ static int __init pseries_kexec_setup(void)
 {
 	ppc_md.machine_kexec = default_machine_kexec;
 	ppc_md.machine_kexec_prepare = default_machine_kexec_prepare;
-	ppc_md.machine_crash_shutdown = default_machine_crash_shutdown;
 
 	return 0;
 }