isci: fix oem parameter header definition

The element_length is 2 bytes.

Reported-by: Yinghai Lu <yinghai.lu@oracle.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/probe_roms.h b/drivers/scsi/isci/probe_roms.h
index f079358..5598336 100644
--- a/drivers/scsi/isci/probe_roms.h
+++ b/drivers/scsi/isci/probe_roms.h
@@ -123,7 +123,7 @@
 	uint8_t version;
 	uint8_t preboot_source;
 	uint8_t num_elements;
-	uint8_t element_length;
+	uint16_t element_length;
 	uint8_t reserved[8];
 } __attribute__ ((packed));