[POWERPC] bootwrapper: Make setprop accept a const buffer.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h
index dae0e3b..4d0cfd7 100644
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -91,7 +91,8 @@
 	return (dt_ops.getprop) ? dt_ops.getprop(devp, name, buf, buflen) : -1;
 }
 
-static inline int setprop(void *devp, const char *name, void *buf, int buflen)
+static inline int setprop(void *devp, const char *name,
+                          const void *buf, int buflen)
 {
 	return (dt_ops.setprop) ? dt_ops.setprop(devp, name, buf, buflen) : -1;
 }