serial: samsung: Simplify DMA engine initialization code
dma_request_slave_channel_compat() requires filter function and mask, which are not needed on device tree based platforms, so simplify the code by calling the more appropriate dma_request_chan() function. This additionally gives us proper error handling, because the new function returns error codes instead of NULL on failure. Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: NSylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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