vp9-svc: Remove unneeded call and init some parameters.
vp9-svc: Remove unneeded call and init some parameters.

Remove the unneeded vp9_copy_flags_ref_update_idx(cpi),
and initialize the struct parameters needed for the
GET_SVC_REF_FRAME_CONFIG. This init is useful for the case
for spatial layer frame drops.

Change-Id: If89e8349f6246c33720ecbb758d41a932d21e496

webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx