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/Seagate/nas220/nas220.c b/board/Seagate/nas220/nas220.c
index c5349b9..18c2895 100644
--- a/board/Seagate/nas220/nas220.c
+++ b/board/Seagate/nas220/nas220.c
@@ -11,6 +11,7 @@
 
 #include <common.h>
 #include <miiphy.h>
+#include <asm/mach-types.h>
 #include <asm/arch/soc.h>
 #include <asm/arch/mpp.h>
 #include <asm/arch/cpu.h>