dmaengine: mv_xor: remove mv_xor_chan->current_type field

Since commit 3e4f52e2da ("dma: mv_xor: Simplify the DMA_MEMCPY
operation"), this field is no longer used, so get rid of it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/mv_xor.c

@@ -169,7 +169,6 @@ static void mv_chan_set_mode(struct mv_xor_chan *chan,
 #endif
 
 	writel_relaxed(config, XOR_CONFIG(chan));
-	chan->current_type = type;
 }
 
 static void mv_chan_set_mode_to_desc(struct mv_xor_chan *chan)