spi: dw: replace magic constant by DW_SPI_DR

The offset 0x60 is the offset of the data register defined as DW_SPI_DR in the
header file. Use it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-dw.c

@@ -483,7 +483,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	dws->master = master;
 	dws->type = SSI_MOTO_SPI;
 	dws->dma_inited = 0;
-	dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
+	dws->dma_addr = (dma_addr_t)(dws->paddr + DW_SPI_DR);
 	snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num);
 
 	ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dws->name, master);