ARM: imx: remove mach/dma-mx1-mx2.h

The header mach/dma-mx1-mx2.h is used nowhere.  Remove it.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-imx/include/mach/dma-mx1-mx2.h

-#ifndef __MACH_DMA_MX1_MX2_H__
-#define __MACH_DMA_MX1_MX2_H__
-/*
- * Don't use this header in new code, it will go away when all users are
- * converted to mach/dma-v1.h
- */
-
-#include <mach/dma-v1.h>
-
-#endif /* ifndef __MACH_DMA_MX1_MX2_H__ */