x86: Add dma-mapping.h to architectural code
Some cross-platform drivers rely on this header present. Make it so for x86. It's just a copy'n'paste of arch/arm/include/asm/dma-mapping.h. Suggested-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
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