ata: pata_atiixp: Fix a function name and supply description for 'pio'

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

 drivers/ata/pata_atiixp.c:103: warning: Function parameter or member 'pio' not described in 'atiixp_set_pio_timing'
 drivers/ata/pata_atiixp.c:241: warning: expecting prototype for atiixp_dma_stop(). Prototype was for atiixp_bmdma_stop() instead

Cc: Jens Axboe <axboe@kernel.dk>
Cc: ATI Inc <hyu@ati.com>
Cc: linux-ide@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/ata/pata_atiixp.c

@@ -93,6 +93,7 @@ static int atiixp_prereset(struct ata_link *link, unsigned long deadline)
  *	atiixp_set_pio_timing	-	set initial PIO mode data
  *	@ap: ATA interface
  *	@adev: ATA device
+ *	@pio: Requested PIO
  *
  *	Called by both the pio and dma setup functions to set the controller
  *	timings for PIO transfers. We must load both the mode number and
@@ -227,7 +228,7 @@ static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
 }
 
 /**
- *	atiixp_dma_stop	-	DMA stop callback
+ *	atiixp_bmdma_stop	-	DMA stop callback
  *	@qc: Command in progress
  *
  *	DMA has completed. Clear the UDMA flag as the next operations will