[POWERPC] Fix compile breakage for IBM/AMCC 4xx arch/ppc platforms

The IBM/AMCC 405 platforms don't compile anymore in the current
kernel version.  This fixes the compile breakage.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/ppc/syslib/ibm_ocp.c b/arch/ppc/syslib/ibm_ocp.c
index 3f6e55c..2ee1766 100644
--- a/arch/ppc/syslib/ibm_ocp.c
+++ b/arch/ppc/syslib/ibm_ocp.c
@@ -1,4 +1,5 @@
 #include <linux/module.h>
+#include <asm/ibm4xx.h>
 #include <asm/ocp.h>
 
 struct ocp_sys_info_data ocp_sys_info = {