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: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NMark Brown <broonie@kernel.org>
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