mmc: sdhci-omap: drop ->get_ro() implementation
The SDHCI core is now properly checking for the state of a WP GPIO, so there is no longer any need for the sdhci-omap code to implement ->get_ro() using mmc_gpio_get_ro(). Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Reviewed-by: Thierry Reding <treding@nvidia.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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