spi/pl022: add PrimeCell generic DMA support
This extends the PL022 SSP/SPI driver with generic DMA engine support using the PrimeCell DMA engine interface. Also fix up the test code for the U300 platform. Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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