spi: dw: Add a symbols namespace for the core module
The exported from the DW SPI driver core/DMA symbols are only used by the spi-dw-{mmio,pci,bt1}.o objects. Add these symbols to a separate namespace then and make sure the depended modules have it imported. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20211115181917.7521-2-Sergey.Semin@baikalelectronics.ruSigned-off-by: Mark Brown <broonie@kernel.org>
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