[POWERPC] spufs: Make file-internal functions & variables static

There are a few symbols used only in one file within spufs; this change
makes them static where suitable.

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 106d292..b5a2117 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -458,7 +458,7 @@
 	return 0;
 }
 
-struct sysdev_class spu_sysdev_class = {
+static struct sysdev_class spu_sysdev_class = {
 	set_kset_name("spu"),
 	.shutdown = spu_shutdown,
 };