[POWERPC] Remove unnecessary #undef printk from prom.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 0782afc..37ff99b 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1056,8 +1056,6 @@
 	DBG(" <- early_init_devtree()\n");
 }
 
-#undef printk
-
 int of_n_addr_cells(struct device_node* np)
 {
 	const int *ip;