dmaengine: add helper function to request a slave DMA channel

Currently slave DMA channels are requested by calling dma_request_channel()
and requires DMA clients to pass various filter parameters to obtain the
appropriate channel.

With device-tree being used by architectures such as arm and the addition of
device-tree helper functions to extract the relevant DMA client information
from device-tree, add a new function to request a slave DMA channel using
device-tree. This function is currently a simple wrapper that calls the
device-tree of_dma_request_slave_channel() function.

Cc: Nicolas Ferre <[email protected]>
Cc: Benoit Cousson <[email protected]>
Cc: Stephen Warren <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Russell King <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Dan Williams <[email protected]>

Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Jon Hunter <[email protected]>
Reviewed-by: Stephen Warren <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

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