Allow for the capture of a firmware dump but have a sysfs node
(allow_cna_fw_dump) to allow the feature to be enabled/disabled dynamically.

The default is off.
Signed-off-by: NChad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: NSaurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>