[PATCH] ppc; include missing header

Include missing header to avoid implicit function declaration warnings
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/mm/init.c

@@ -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>