spi: rockchip: support "sleep" pin configuration
In the pattern of many other devices, support a system-sleep pin configuration. Signed-off-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Caesar Wang <wxt@rock-chips.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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