spi: dw: Add KeemBay Master capability
In a further commit we'll have to get rid of the update_cr0() callback and define a DW SSI capability instead. Since Keem Bay master/slave functionality is controller by the CTRL0 register bitfield, we need to first move the master mode selection into the internal corresponding update_cr0 method, which would be activated by means of the dedicated DW_SPI_CAP_KEEMBAY_MST capability setup. Note this will be also useful if the driver will be ever altered to support the DW SPI slave interface. Signed-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru> Link: https://lore.kernel.org/r/20200920112914.26501-11-Sergey.Semin@baikalelectronics.ruSigned-off-by: NMark Brown <broonie@kernel.org>
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