scsi: sym53c8xx_2: Add missing description for 'pdev'

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

 drivers/scsi/sym53c8xx_2/sym_glue.c:1784: warning: Function parameter or member 'pdev' not described in 'sym2_reset_workarounds'

Link: https://lore.kernel.org/r/20200721164148.2617584-38-lee.jones@linaro.org
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Gerard Roudier <groudier@free.fr>
Cc: Wolfgang Stanglmeier <wolf@cologne.de>
Cc: Stefan Esser <se@mi.Uni-Koeln.de>
Cc: Richard Waltham <dormouse@farsrobt.demon.co.uk>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sym53c8xx_2/sym_glue.c

@@ -1774,6 +1774,7 @@ static pci_ers_result_t sym2_io_slot_dump(struct pci_dev *pdev)
 
 /**
  * sym2_reset_workarounds - hardware-specific work-arounds
+ * @pdev: pointer to PCI device
  *
  * This routine is similar to sym_set_workarounds(), except
  * that, at this point, we already know that the device was