spi: add "spi-lsb-first" to devicetree
add optional property devicetree for SPI slave nodes into devicetree so that LSB mode can be enabled by devicetree. Signed-off-by:Zhao Qiang <B45475@freescale.com> Signed-off-by:
Mark Brown <broonie@linaro.org> (cherry picked from commit cd6339e6) (cherry picked from commit 09623c20b3e6b11a914343d4b0f15b63e683f0d8)
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