vp9-svc: Add layer bitrate targeting to SVC datarate tests.
Modify and update the SVC datarate unittests to verify the rate targeting for each spatial-temporal layer. The current tests were only verifying the rate targeting of the full SVC stream, not individual layers. Also re-enabled a test that was disabled. This is a stronger verification of the layered rate control for SVC for 1 pass CBR encoding. Added PostEncodeFrameHook, needed to get the layer_id and update the layer buffer level. Change-Id: I9fd54ad474686b20a6de3250d587e2cec194a56f
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