powerpc: Move smp_hw_index to 32-bit code

smp_hw_index isn't used on 64-bit, so move it from smp.c to
setup_32.c.

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index cc4679e..086c23c 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -49,6 +49,8 @@
 EXPORT_SYMBOL_GPL(boot_cpuid);
 int boot_cpuid_phys;
 
+int smp_hw_index[NR_CPUS];
+
 unsigned long ISA_DMA_THRESHOLD;
 unsigned int DMA_MODE_READ;
 unsigned int DMA_MODE_WRITE;
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index a59d8d7..ffcb177 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -57,7 +57,6 @@
 #define DBG(fmt...)
 #endif
 
-int smp_hw_index[NR_CPUS];
 struct thread_info *secondary_ti;
 
 cpumask_t cpu_possible_map = CPU_MASK_NONE;