The dump_au1000_dma_channel() has not been used since
commit d56b9b9c ("[PATCH] The scheduled removal of some OSS
drivers"), so remove it.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>