i40e: Fix VEB/VEPA bridge mode mismatch issue

i40e: Fix VEB/VEPA bridge mode mismatch issue

Orabug: 22342532

Fix i40e_is_vsi_uplink_mode_veb to check if bridge is actually
in VEB mode before allowing LB in the add VSI routine, instead of
unconditionally returning VEB bridge mode.

Change-ID: I162397b1bdd02367735fe9baaeb51465be2a3ce9
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 09603eaa5ca91dd9a318d8722ff5de8feb1e36ab)
Signed-off-by: Brian Maly <brian.maly@oracle.com>