For ISP28xx, use 28xx call to retrieve active FW region.

Link: https://lore.kernel.org/r/20200212214436.25532-21-hmadhani@marvell.comSigned-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>