ioatdma: allow all channels to have irq coalescing support

Looks like only the RAID channels are allowed to have irq coalescing support
in the existing code. Fixing that. The ioat3 cleanup code can handle memcpy
ops anyways

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dan Williams <djbw@fb.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index dc8dcfb..a1dcfb2 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -1331,15 +1331,9 @@
 	}
 
 
-	if (is_raid_device) {
-		dma->device_tx_status = ioat3_tx_status;
-		device->cleanup_fn = ioat3_cleanup_event;
-		device->timer_fn = ioat3_timer_event;
-	} else {
-		dma->device_tx_status = ioat_dma_tx_status;
-		device->cleanup_fn = ioat2_cleanup_event;
-		device->timer_fn = ioat2_timer_event;
-	}
+	dma->device_tx_status = ioat3_tx_status;
+	device->cleanup_fn = ioat3_cleanup_event;
+	device->timer_fn = ioat3_timer_event;
 
 	#ifdef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
 	dma_cap_clear(DMA_PQ_VAL, dma->cap_mask);