MLK-10502-1 spi: spi-imx: add bits_per_word checking in dma mode
Before, hardcode buswidth as 1byte while config dma channel. Correct it to
dynamically config per buswidth setting. This patch cherry-pick from v3.10.y
ccf74d50f7f85b6606d06a0245a72d22601ac9d8
Signed-off-by:
Robin Gong <b38343@freescale.com>
(cherry picked from commit 7e27c398b96fadd5302e8e51454860ab667fb9ad)
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