Revert "i2c: tegra: Synchronize DMA before termination"

This reverts commit 8814044fe0fa182abc9ff818d3da562de98bc9a7 because
regressions were showing up.

Suggested-by: Thierry Reding <[e-mail]>
Link: https://lore.kernel.org/dmaengine/[e-mail]/
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/busses/i2c-tegra.c

···
 		time_left = tegra_i2c_wait_completion_timeout(
 				i2c_dev, &i2c_dev->dma_complete, xfer_time);
 
-		/*
-		 * Synchronize DMA first, since dmaengine_terminate_sync()
-		 * performs synchronization after the transfer's termination
-		 * and we want to get a completion if transfer succeeded.
-		 */
-		dmaengine_synchronize(i2c_dev->msg_read ?
-				      i2c_dev->rx_dma_chan :
-				      i2c_dev->tx_dma_chan);
-
 		dmaengine_terminate_sync(i2c_dev->msg_read ?
 					 i2c_dev->rx_dma_chan :
 					 i2c_dev->tx_dma_chan);