i40e: restore promiscuous after reset

After a reset we rebuild the VSIs which is going to clobber any
promiscuous settings we had before reset.  This makes it so that we
restore the promiscuous settings we had before reset.

Signed-off-by: Alan Brady <alan.brady@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>