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When application requests simulcast, libwebrtc configures
temporal layers on each stream. If VaapiVEA and V4L2VEA refuses
the temporal layer encoding, then we cannot make use of
HW encoders on ChromeOS in simulcast case. Ignoring temporal
layers and producing a  simple stream causes a little less
flexibility on a video call background, but not so critical.
So V4L2VEA and VaapiVEA ignores the request as intended.

Bug: 1030199, 1071089
Test: webrtc.RTCPeerConnection.*
Change-Id: Iff153d76c05a1a994a609b97956dbb1fe041c627
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154359
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760392}