drivers/net: decouple ISA and ISA_DMA_API
The two options are separate, and some platforms (e.g. arm pxa) have ISA slots but no ISA dma controller, so they cannot build drivers using the DMA API functions. Signed-off-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NMathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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