spi: dw: Convert to use CS GPIO descriptors
This converts the DesignWare (dw) SPI master driver to use GPIO descriptors for chip select handling. This driver has a duplicate DT parser in addition to the one in the core, sets up the line as non-asserted and relies on the core to drive the GPIOs. It is a pretty straight-forward conversion. Cc: Talel Shenhar <talel@amazon.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Linuxarm <linuxarm@huawei.com> Tested-by: NJay Fang <f.fangjian@huawei.com> Reviewed-by: NAlexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NMark Brown <broonie@kernel.org>
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