[U-Boot] dma: import linux/dma-direction.h to consolidate enum dma_data_direction

[Tom Rini]

On Sat, Aug 26, 2017 at 12:50:17AM +0900, Masahiro Yamada wrote:

> Import include/linux/dma-direction.h from Linux 4.13-rc7 and delete
> duplicated definitions of enum dma_data_direction.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

Applied to u-boot/master, thanks!

-- 
Tom
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