ice: Pull common tasks into ice_vf_post_vsi_rebuild

The Single Root IOV implementation of .post_vsi_rebuild performs some tasks
that will ultimately need to be shared with the Scalable IOV implementation
such as rebuilding the host configuration.

Refactor by introducing a new wrapper function, ice_vf_post_vsi_rebuild
which performs the tasks that will be shared between SR-IOV and Scalable
IOV. Move the ice_vf_rebuild_host_cfg and ice_vf_set_initialized calls into
this wrapper. Then call the implementation specific post_vsi_rebuild
handler afterwards.

This ensures that we will properly re-initialize filters and expected
settings for both SR-IOV and Scalable IOV.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Marek Szlosek <marek.szlosek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>