dmaengine: altera-msgdma: Fixed some inconsistent function name descriptions

Inconsistent function names describing msgdma_chan_remove() and
msgdma_dma_remove are modified to msgdma_dev_remove() and msgdma_remove().

Remove some warnings found by running scripts/kernel-doc, which is caused
by using 'make W=1'.

drivers/dma/altera-msgdma.c:927: warning: expecting prototype for msgdma_dma_remove(). Prototype was for msgdma_remove() instead.
drivers/dma/altera-msgdma.c:758: warning: expecting prototype for msgdma_chan_remove(). Prototype was for msgdma_dev_remove() instead.

Signed-off-by: Jiapeng Chong <[e-mail]>
Reviewed-by: Stefan Roese <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/altera-msgdma.c

···
 }
 
 /**
- * msgdma_chan_remove - Channel remove function
+ * msgdma_dev_remove() - Device remove function
  * @mdev: Pointer to the Altera mSGDMA device structure
  */
 static void msgdma_dev_remove(struct msgdma_device *mdev)
···
 }
 
 /**
- * msgdma_dma_remove - Driver remove function
+ * msgdma_remove() - Driver remove function
  * @pdev: Pointer to the platform_device structure
  *
  * Return: Always '0'