mmc: sdhci: implement the .card_event() method
Extracting a part of the SDHCI card tasklet into a .card_event() implementation allows SDHCI hosts to use generic card-detection services, e.g. the GPIO slot function. Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Reviewed-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NChris Ball <cjb@laptop.org>
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