Currently, VDEV manager responses are using legacy path instead of
target_if, vdev_mgr and os_if components. As the driver implementation
is planned for converged model, legacy implementation will be moved to
the respective components.
To avoid rework, Use target_if, vdev_mgr and os_if components to process
the FW responses corresponding to the vdev manager.
Change-Id: I778f6de93481fc730383e8f8e1c604f173947d69
CRs-Fixed: 3093776