scsi: aacraid: Add descriptions for missing parameters

Also clean-up some white space issues while we're here.

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

 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'p2' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'p3' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'p4' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'p5' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'p6' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'r1' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'r2' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'r3' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:147: warning: Function parameter or member 'r4' not described in 'sa_sync_cmd'
 drivers/scsi/aacraid/sa.c:290: warning: Function parameter or member 'dev' not described in 'aac_sa_ioremap'

Link: https://lore.kernel.org/r/20200721164148.2617584-4-lee.jones@linaro.org


Cc: Adaptec OEM Raid Solutions <aacraid@microsemi.com>
Cc: "PMC-Sierra, Inc" <aacraid@pmc-sierra.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>