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Originally V4L2SVD tried to decode new buffers after any error occurs,
i.e. at |kError| state. In this CL, we only handle the decoder request
at |kDecode| state.

BUG=b:140842667
TEST=run video_decode_accelerator_tests on Kevin

Change-Id: Ib785b5d1e51a1489ce1340b03e2b10c2d1b45a7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818011Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699263}