Revert "Roll src/third_party/libaom/source/libaom/ 9680f2b17..bacc12361 (59 commits)"

This reverts commit cbd0bd47815767168603e495804a2ed7e1057f02.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/6209566111956992

Sample build with failed test: https://ci.chromium.org/b/8718110927695338545
Affected test(s):
[ninja://media:media_unittests/SVCVideoEncoderTest.ChangeLayers/Av1TemporalSvc.av1__av1_profile_main__PIXEL_FORMAT_I420__L1T2](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fmedia:media_unittests%2FSVCVideoEncoderTest.ChangeLayers%2FAv1TemporalSvc.av1__av1_profile_main__PIXEL_FORMAT_I420__L1T2?q=VHash%3A274aea5d1c0785bc)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F6209566111956992&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F6441286&type=BUG

Original change's description:
> Roll src/third_party/libaom/source/libaom/ 9680f2b17..bacc12361 (59 commits)
>
> https://aomedia.googlesource.com/aom.git/+log/9680f2b1781f..bacc12361483
>
> $ git log 9680f2b17..bacc12361 --date=short --no-merges --format='%ad %ae %s'
> 2025-04-03 marpan Fix to update seq_params for number of layers change
> 2025-04-04 jianj Revert "Merge branch 'highway-experimental' into hwy-merge"
> 2025-04-04 jianj Revert "Rename highway .cc files"
> 2025-04-04 jianj Revert "benchmark: Unify control config CONFIG_BENCHMARK"
> 2025-04-04 jianj Revert "fwd_txfm2d: Fix undefined left shift in SetPair"
> 2025-04-04 jdorfman fwd_txfm2d: Fix undefined left shift in SetPair
> 2025-04-02 jianj benchmark: Unify control config CONFIG_BENCHMARK
> 2025-04-02 jianj Rename highway .cc files
> 2025-04-01 jingning Apply consistent motion search constraints
> 2025-04-01 jianj highway: Add hwy to install list
> (...)
> 2025-03-10 jdorfman sad: template the width of SumOfAbsoluteDiff
> 2025-03-10 jdorfman benchmark: Don't run benchmarks by default
> 2025-03-06 jianj Add highway avx2 sad functions to benchmark test
> 2025-03-07 jianj Add license to sad_hwy.cc
> 2025-03-05 jianj Add benchmark as third_party dependency
> 2025-02-27 jianj Add example sad avx2 implementation with highway
> 2025-03-05 jianj Re-enable -Wmissing-prototypes for highway
> 2025-03-05 jianj Update highway to 0401673bef6
> 2025-02-20 jianj Add highway in third_party
> 2025-02-20 jianj cmake: write a function to disable warning flags
>
> Created with:
>   roll-dep src/third_party/libaom/source/libaom
> R=jzern@google.com
>
> b: 307414544, b:407813259
> Change-Id: I1e31d31f3229941432addf5d9be72ab75ac4e806
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6441286
> Commit-Queue: James Zern <jzern@google.com>
> Reviewed-by: Wan-Teh Chang <wtc@google.com>
> Reviewed-by: James Zern <jzern@google.com>
> Cr-Commit-Position: refs/heads/main@{#1444412}
>

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I212b0088251c20f43b2dbdf8f237a46e9cb40ecb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6442206
Reviewed-by: Devon Loehr <dloehr@google.com>
Reviewed-by: Wan-Teh Chang <wtc@google.com>
Commit-Queue: Devon Loehr <dloehr@google.com>
Cr-Commit-Position: refs/heads/main@{#1444710}