arm: Add explicit include of <asm/mach-types.h>

Rather than relying on common.h to provide this include, which is going
away at some point, include it explicitly in each file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/siemens/common/board.c b/board/siemens/common/board.c
index 9cafcea..b967227 100644
--- a/board/siemens/common/board.c
+++ b/board/siemens/common/board.c
@@ -28,6 +28,7 @@
 #include <miiphy.h>
 #include <cpsw.h>
 #include <watchdog.h>
+#include <asm/mach-types.h>
 #include "../common/factoryset.h"
 
 DECLARE_GLOBAL_DATA_PTR;