[POWERPC] 4xx: Include missing header

A small error caused a header file to be removed making sequoia support no
longer compile.  Fix it.
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>

arch/powerpc/platforms/44x/sequoia.c

@@ -23,6 +23,7 @@
 #include <asm/uic.h>
 #include <asm/pci-bridge.h>
 
+#include "44x.h"
 
 static struct of_device_id sequoia_of_bus[] = {
 	{ .compatible = "ibm,plb4", },