dma: xilinx_dpdma: Remove unnecessary use of irqsave/restore

xilinx_dpdma_chan_done_irq and xilinx_dpdma_chan_vsync_irq are always
called with IRQs disabled from xilinx_dpdma_irq_handler. Therefore we
don't need to save/restore the IRQ flags.

Signed-off-by: Sean Anderson <[e-mail]>
Reviewed-by: Tomi Valkeinen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/xilinx/xilinx_dpdma.c

···
 static void xilinx_dpdma_chan_done_irq(struct xilinx_dpdma_chan *chan)
 {
 	struct xilinx_dpdma_tx_desc *active;
-	unsigned long flags;
 
-	spin_lock_irqsave(&chan->lock, flags);
+	spin_lock(&chan->lock);
 
 	xilinx_dpdma_debugfs_desc_done_irq(chan);
 
···
 			 "chan%u: DONE IRQ with no active descriptor!\n",
 			 chan->id);
 
-	spin_unlock_irqrestore(&chan->lock, flags);
+	spin_unlock(&chan->lock);
 }
 
 /**
···
 {
 	struct xilinx_dpdma_tx_desc *pending;
 	struct xilinx_dpdma_sw_desc *sw_desc;
-	unsigned long flags;
 	u32 desc_id;
 
-	spin_lock_irqsave(&chan->lock, flags);
+	spin_lock(&chan->lock);
 
 	pending = chan->desc.pending;
 	if (!chan->running || !pending)
···
 	xilinx_dpdma_chan_queue_transfer(chan);
 
 out:
-	spin_unlock_irqrestore(&chan->lock, flags);
+	spin_unlock(&chan->lock);
 }
 
 /**