pata_platform: don't use generic ata_port_start
I have a system where I have a simple IDE controller that sits on a local bus without bus master dma capability, and thus no dma_mapping ops defined for the device/bus. pata_platform works great for me, with the exception of using the generic ata_port_start which tries to do a dmam_alloc_coherent. Looks like it doesn't need to allocate a prd table at all, so replace it with a dummy function instead. Signed-off-by: NOlof Johansson <olof@lixom.net> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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