dmaengine: ep93xx: Remove redundant word in comment

Remove the second 'to' which is repeated.
Signed-off-by: jianchunfu <jianchunfu@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20220403123120.7794-1-jianchunfu@cmss.chinamobile.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ep93xx_dma.c

@@ -132,7 +132,7 @@ struct ep93xx_dma_desc {
 /**
  * struct ep93xx_dma_chan - an EP93xx DMA M2P/M2M channel
  * @chan: dmaengine API channel
- * @edma: pointer to to the engine device
+ * @edma: pointer to the engine device
  * @regs: memory mapped registers
  * @irq: interrupt number of the channel
  * @clk: clock used by this channel