mmc: sdhci: remove unneeded (void *) casts in sdhci_(pltfm_)priv()

The type of host->private is (unsigned long *).  No cast is needed
to return an opaque pointer.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 2570455..9c35776 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -656,7 +656,7 @@ extern void sdhci_free_host(struct sdhci_host *host);
 
 static inline void *sdhci_priv(struct sdhci_host *host)
 {
-	return (void *)host->private;
+	return host->private;
 }
 
 extern void sdhci_card_detect(struct sdhci_host *host);