mmc: mxs-mmc: add cd-inverted property
The card-detect GPIO is inverted on some boards. Handle such case. Acked-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: NChris Ball <cjb@laptop.org>
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