dmaengine: remove DMA_SG as it is dead code in kernel
There are no in kernel consumers for DMA_SG op. Removing operation, dead code, and test code in dmatest. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Cc: Gary Hook <gary.hook@amd.com> Cc: Ludovic Desroches <ludovic.desroches@microchip.com> Cc: Kedareswara rao Appana <appana.durga.rao@xilinx.com> Cc: Li Yang <leoyang.li@nxp.com> Cc: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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