mmc: sdhci-of-at91: Use sdhci_pltfm_remove()

Use sdhci_pltfm_remove() instead of sdhci_pltfm_unregister() because
sdhci_pltfm_unregister() is going to be removed.

Signed-off-by: Adrian Hunter <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci-of-at91.c

···
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
 
-	sdhci_pltfm_unregister(pdev);
+	sdhci_pltfm_remove(pdev);
 
 	clk_disable_unprepare(gck);
 	clk_disable_unprepare(hclock);