dmaengine: iop-adma: Function parameter documentation must adhere to correct formatting

Also remove superfluous entry.

Fixes the following W=1 kernel build warning(s):

 drivers/dma/iop-adma.c:418: warning: Function parameter or member 'chan' not described in 'iop_adma_alloc_chan_resources'
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200714111546.1755231-13-lee.jones@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/iop-adma.c

@@ -406,8 +406,7 @@ static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
 
 /**
  * iop_adma_alloc_chan_resources -  returns the number of allocated descriptors
- * @chan - allocate descriptor resources for this channel
- * @client - current client requesting the channel be ready for requests
+ * @chan: allocate descriptor resources for this channel
  *
  * Note: We keep the slots for 1 operation on iop_chan->chain at all times.  To
  * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be