spi: pl022: use generic DMA slave configuration if possible

With the new OF DMA binding, it is possible to completely avoid the
need for platform_data for configuring a DMA channel. In cases where the
platform has already been converted, calling dma_request_slave_channel
should get all the necessary information from the device tree.

Like the patch that converts the dw_dma controller, this is completely
untested and is looking for someone to try it out.

Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Grant Likely <[email protected]>
Acked-by: Mark Brown <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Cc: [email protected]
Cc: Viresh Kumar <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: [email protected]
Cc: [email protected]

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