mmc: sdhci: set the .remove to sdhci_pltfm_unregister()

In these drivers, the driver specific .remove function just a simple
wrapper of function sdhci_pltfm_unregister(). So remove these wrappers
and just set .remove to sdhci_pltfm_unregister().

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/sdhci-sirf.c b/drivers/mmc/host/sdhci-sirf.c
index f3c8d8d..32848eb 100644
--- a/drivers/mmc/host/sdhci-sirf.c
+++ b/drivers/mmc/host/sdhci-sirf.c
@@ -193,13 +193,6 @@
 	return ret;
 }
 
-static int sdhci_sirf_remove(struct platform_device *pdev)
-{
-	struct sdhci_host *host = platform_get_drvdata(pdev);
-
-	return sdhci_pltfm_unregister(pdev);
-}
-
 #ifdef CONFIG_PM_SLEEP
 static int sdhci_sirf_suspend(struct device *dev)
 {
@@ -249,7 +242,7 @@
 #endif
 	},
 	.probe		= sdhci_sirf_probe,
-	.remove		= sdhci_sirf_remove,
+	.remove		= sdhci_pltfm_unregister,
 };
 
 module_platform_driver(sdhci_sirf_driver);