spi/pl022: Add chip select handling via GPIO
This patch adds the ability for the driver to control the chip select directly. This enables independence from cs_control callbacks. Configurable via platform_data, to be extended as DT in the following patch. Based on the initial patch by Alexandre Pereira da Silva <aletes.xgr@gmail.com> Signed-off-by: NRoland Stigge <stigge@antcom.de> Acked-by: NAlexandre Pereira da Silva <aletes.xgr@gmail.com> Reviewed-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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