scsi: bnx2i: Add missing descriptions for 'attr' parameter

scsi: bnx2i: Add missing descriptions for 'attr' parameter

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

 drivers/scsi/bnx2i/bnx2i_sysfs.c:40: warning: Function parameter or member 'attr' not described in 'bnx2i_show_sq_info'
 drivers/scsi/bnx2i/bnx2i_sysfs.c:60: warning: Function parameter or member 'attr' not described in 'bnx2i_set_sq_info'
 drivers/scsi/bnx2i/bnx2i_sysfs.c:96: warning: Function parameter or member 'attr' not described in 'bnx2i_show_ccell_info'
 drivers/scsi/bnx2i/bnx2i_sysfs.c:114: warning: Function parameter or member 'attr' not described in 'bnx2i_set_ccell_info'

Link: https://lore.kernel.org/r/20200723122446.1329773-9-lee.jones@linaro.org
Cc: QLogic-Storage-Upstream@qlogic.com
Cc: Anil Veerabhadrappa <anilgv@broadcom.com>
Cc: Eddie Wai <eddie.wai@broadcom.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>