mmc: cavium-octeon: remove nonsense variable coercion

In this function, the variable 'base' is already 'void __iomem *base',
and the return function 'devm_platform_ioremap_resource()' also returns
this type, so the mandatory definition here is redundant.
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20200327043639.6564-1-tangbin@cmss.chinamobile.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/cavium-octeon.c

@@ -207,13 +207,13 @@ static int octeon_mmc_probe(struct platform_device *pdev)
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
-	host->base = (void __iomem *)base;
+	host->base = base;
 	host->reg_off = 0;
 
 	base = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
-	host->dma_base = (void __iomem *)base;
+	host->dma_base = base;
 	/*
 	 * To keep the register addresses shared we intentionaly use
 	 * a negative offset here, first register used on Octeon therefore