scsi: bfa: Demote seemingly unintentional kerneldoc header

scsi: bfa: Demote seemingly unintentional kerneldoc header

This is the only use of kerneldoc in the source file and no descriptions
are provided.

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

 drivers/scsi/bfa/bfa_fcpim.c:3829: warning: Function parameter or member 'bfa' not described in 'bfa_fcpim_get_throttle_cfg'
 drivers/scsi/bfa/bfa_fcpim.c:3829: warning: Function parameter or member 'drv_cfg_param' not described in 'bfa_fcpim_get_throttle_cfg'

Link: https://lore.kernel.org/r/20200723122446.1329773-11-lee.jones@linaro.org
Cc: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Cc: Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>