dmaengine: remove FSLDMA_EXTERNAL_START

as users have been converted, so no need of this custom method

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 7e6b3a2..f8e5a9e 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -199,15 +199,12 @@
  * configuration data in statically from the platform). An additional
  * argument of struct dma_slave_config must be passed in with this
  * command.
- * @FSLDMA_EXTERNAL_START: this command will put the Freescale DMA controller
- * into external start mode.
  */
 enum dma_ctrl_cmd {
 	DMA_TERMINATE_ALL,
 	DMA_PAUSE,
 	DMA_RESUME,
 	DMA_SLAVE_CONFIG,
-	FSLDMA_EXTERNAL_START,
 };
 
 /**