ata: pata_hpt366: Provide missing description for 'hpt366_filter()'s 'mask' param

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

drivers/ata/pata_hpt366.c:200: warning: Function parameter or member 'mask' not described in 'hpt366_filter'

Cc: Jens Axboe <[e-mail]>
Cc: Andre Hedrick <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/ata/pata_hpt366.c

···
 /**
  *	hpt366_filter	-	mode selection filter
  *	@adev: ATA device
+ *	@mask: Current mask to manipulate and pass back
  *
  *	Block UDMA on devices that cause trouble with this controller.
  */