Include missing header to avoid implicit function declaration warnings

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 init.c |    1 +
 1 files changed, 1 insertion(+)
---
Index: 2.6.10-mm2/arch/ppc/mm/init.c
===================================================================
--- 2.6.10-mm2/arch/ppc/mm/init.c	(revision 141)
+++ 2.6.10-mm2/arch/ppc/mm/init.c	(working copy)
@@ -31,6 +31,7 @@
 #include <linux/bootmem.h>
 #include <linux/highmem.h>
 #include <linux/initrd.h>
+#include <linux/pagemap.h>
 
 #include <asm/pgalloc.h>
 #include <asm/prom.h>