powerpc/kexec: Remove ppc_md.machine_kexec

No one uses ppc_md.machine_kexec, so remove it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index fae6764..43836aa 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -85,10 +85,7 @@
  */
 void machine_kexec(struct kimage *image)
 {
-	if (ppc_md.machine_kexec)
-		ppc_md.machine_kexec(image);
-	else
-		default_machine_kexec(image);
+	default_machine_kexec(image);
 
 	/* Fall back to normal restart if we're still alive. */
 	machine_restart(NULL);