mmc: meson-gx: constify member data of struct meson_host

Constify member data of struct meson_host. This also allows to remove
the cast as of_device_get_match_data() returns a const void *.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/70e5520f-e327-111d-9ea4-824460e41561@gmail.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/meson-gx-mmc.c

@@ -150,7 +150,7 @@ struct sd_emmc_desc {
 
 struct meson_host {
 	struct	device		*dev;
-	struct	meson_mmc_data *data;
+	const struct meson_mmc_data *data;
 	struct	mmc_host	*mmc;
 	struct	mmc_command	*cmd;
 
@@ -1195,8 +1195,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	if (mmc->caps & MMC_CAP_SDIO_IRQ)
 		mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
 
-	host->data = (struct meson_mmc_data *)
-		of_device_get_match_data(&pdev->dev);
+	host->data = of_device_get_match_data(&pdev->dev);
 	if (!host->data)
 		return -EINVAL;