ppc4xx: Fix compilation problems with phys_size_t

This patch includes <asm/types.h> before <asm/u-boot.h> in some 4xx
board specific files where it has been missing.

Signed-off-by: Stefan Roese <sr@denx.de>

board/amirix/ap1000/serial.c

@@ -19,6 +19,7 @@
  *
  */
 
+#include <asm/types.h>
 #include <asm/u-boot.h>
 #include <asm/processor.h>
 #include <common.h>

board/exbitgen/exbitgen.c

@@ -1,3 +1,4 @@
+#include <asm/types.h>
 #include <asm/u-boot.h>
 #include <asm/processor.h>
 #include <common.h>

board/exbitgen/flash.c

@@ -28,6 +28,7 @@
  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  */
 
+#include <asm/types.h>
 #include <asm/u-boot.h>
 #include <asm/processor.h>
 #include <ppc4xx.h>

board/ml2/serial.c

@@ -19,6 +19,7 @@
  *
  */
 
+#include <asm/types.h>
 #include <asm/u-boot.h>
 #include <asm/processor.h>
 #include <common.h>

board/xilinx/ml300/serial.c

@@ -36,6 +36,7 @@
  *
  */
 
+#include <asm/types.h>
 #include <asm/u-boot.h>
 #include <asm/processor.h>
 #include <common.h>