spi: spi-fsl-dspi: Make bus-num property optional
The SPI bus number is completely optional to Linux, so make the corresponding device tree property optional as well. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Link: https://lore.kernel.org/r/20200305115546.31814-1-s.hauer@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>
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