bfin: Remove spi dma function in bf5xx.
BF5xx rx dma causes spi flash random read error. Accually spi controller has problems both on tx and rx dma. So remove spi dma support in u-boot. Signed-off-by: NScott Jiang <scott.jiang.linux@gmail.com> Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
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