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/gumstix/duovero/duovero.c b/board/gumstix/duovero/duovero.c
index fefcde8..849224e 100644
--- a/board/gumstix/duovero/duovero.c
+++ b/board/gumstix/duovero/duovero.c
@@ -14,6 +14,7 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/gpio.h>
 #include <asm/gpio.h>
+#include <asm/mach-types.h>
 
 #include "duovero_mux_data.h"