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vp9-svc: Modify choose_partitioning for second temporal ref

For mode where second temporal reference is used in SVC: allow
for using/testing this reference (golden ref) in the variance
partition scheme (choose_partitioning).

Small positive gain (~0.25%) on metrics for 3 layer SVC,
negligible change in speed.

Change-Id: I29b8315da530e60db3d6c90faa8fb178d9f2de26

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1317,7 +1317,8 @@

     assert(yv12 != NULL);

-    if (!(is_one_pass_cbr_svc(cpi) && cpi->svc.spatial_layer_id)) {

+    if (!(is_one_pass_cbr_svc(cpi) && cpi->svc.spatial_layer_id) ||

+        cpi->svc.use_longterm_ref_current_layer) {

       // For now, GOLDEN will not be used for non-zero spatial layers, since

       // it may not be a temporal reference.

       yv12_g = get_ref_frame_buffer(cpi, GOLDEN_FRAME);