dma: coh901318: remove hardcoded target addresses

Nowadays the clients should use the dmaengine framework to
tell the DMA driver what target address to use, so delete
these addresses, they are for an out-of-tree driver anyway.

Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>