ata: pata_sil680: Add some missing function parameter docs

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

drivers/ata/pata_sil680.c:68: warning: Function parameter or member 'adev' not described in 'sil680_seldev'
drivers/ata/pata_sil680.c:254: warning: Function parameter or member 'try_mmio' not described in 'sil680_init_chip'

Cc: Jens Axboe <[e-mail]>
Cc: Andre Hedrick <[e-mail]>
Cc: Red Hat <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jens Axboe <[e-mail]>

drivers/ata/pata_sil680.c

···
 /**
  *	sil680_seldev		-	return register base
  *	@ap: ATA interface
+ *	@adev: ATA device
  *	@r: config offset
  *
  *	Turn a config register offset into the right address in PCI space
···
 /**
  *	sil680_init_chip		-	chip setup
  *	@pdev: PCI device
+ *	@try_mmio: Indicates to caller whether MMIO should be attempted
  *
  *	Perform all the chip setup which must be done both when the device
  *	is powered up on boot and when we resume in case we resumed from RAM.