spi: davinci: remove unnecessary typecast

The typecasting of SPI base address to davinci_spi_reg is
unused.

Remove it.
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Tested-By: Brian Niebuhr <bniebuhr@efjohnson.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

drivers/spi/davinci_spi.c

@@ -1020,8 +1020,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
 		goto free_master;
 	}
 
-	davinci_spi->base = (struct davinci_spi_reg __iomem *)
-			ioremap(r->start, davinci_spi->region_size);
+	davinci_spi->base = ioremap(r->start, davinci_spi->region_size);
 	if (davinci_spi->base == NULL) {
 		ret = -ENOMEM;
 		goto release_region;