i40e: Add a call to set the client interface down

i40e: Add a call to set the client interface down

Orabug: 24568124

We were failing to set the client interface down when we put the VSI
down. Add this call so that the client doesn't get an open called with
no close.

Also remove an un-needed delay. The VF should not be affected at all by
i40e_down.

Change-ID: I1135dffef534bf84e6fed57cf51bcf590e6cfaf7
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit f980d445e5ae71c64e1a8e07e9cbf7bb285d1106)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>