Arm backend: Change QAT weight observer

[wwwind]

We change QAT weight observer from FusedMovingAvgObsFakeQuantize to FakeQuantize with a true MinMaxObserver

Change-Id: I3d0f41def9332d23265392a3dd463ecda0755020

Signed-off-by: Elena Zhelezina elena.zhelezina@arm.com

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 1 New Failure, 1 Pending, 1 Unrelated Failure

As of commit aceae5e with merge base 7565342 ():

NEW FAILURE - The following job has failed:

• trunk / test-selective-build-macos (cmake) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  test_exported_decoder_xnnpack

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