powerpc/kexec: Add ifdef CONFIG_PPC_STD_MMU_64 to PPC64 code

This patch introduces PPC64 specific #ifdef bits from the upstream
commit: b3df895aebe091b1657a42a8c859bd49fc96646b.

Reported-and-tested-by: dann frazier <da...@dannf.org>
Signed-off-by: Kumar Gala <ga...@kernel.crashing.org>
Signed-off-by: Kamalesh Babulal <kamal...@linux.vnet.ibm.com>
cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
cc: Anton Blanchard <an...@samba.org>
---
diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index fe02e71..4de36b8 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -163,6 +163,7 @@ static void crash_kexec_prepare_cpus(int cpu)
 }
 
 /* wait for all the CPUs to hit real mode but timeout if they don't come in */
+#ifdef CONFIG_PPC_STD_MMU_64
 static void crash_kexec_wait_realmode(int cpu)
 {
        unsigned int msecs;
@@ -187,6 +188,7 @@ static void crash_kexec_wait_realmode(int cpu)
        }
        mb();
 }
+#endif
 
 /*
  * This function will be called by secondary cpus or by kexec cpu
@@ -445,7 +447,9 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
        crash_kexec_prepare_cpus(crashing_cpu);
        cpu_set(crashing_cpu, cpus_in_crash);
        crash_kexec_stop_spus();
+#ifdef CONFIG_PPC_STD_MMU_64
        crash_kexec_wait_realmode(crashing_cpu);
+#endif
        if (ppc_md.kexec_cpu_down)
                ppc_md.kexec_cpu_down(1, 0);
 }


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