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CL:2246846 modified the VaapiVideoDecodeAccelerator to use
BufferAllocationMode::kNone for H.264 on Gemini Lake or later. However,
for older devices, it started using kSuperReduced mode which caused
widespread failures on resolution change tests.

This CL brings back the original fallback to kReduced for H.264 which
shouldn't have been removed in the previous CL anyway.

Bug: b:159661743, b:159659506, 910986, 1054097
Test: video.DecodeAccel.h264_resolution_switch on pyro & caroline.
Test: video.Seek.switch_h264_alt on pyro & caroline.
Change-Id: I3eb883b8d68c60469751db4a12049ab56e60a0b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260937
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781440}