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GPIOs can be used in MMC/SD-card slots not only for hotplug detection, but also to implement the write-protection pin. Rename cd-gpio helpers to slot-gpio to make addition of further slot GPIO functions possible. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>