Consistently implement persistent port disable.

Ability was to be managed in the adapter via firmware via flash settings.
However, not all firmware images supported it. Uniformly support it
everywhere.
Signed-off-by: NJames Smart <James.Smart@emulex.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>