Fix TPC.v4 for qunatizing merge-ops weights per-tensor.

[elad-c]

Pull Request Description:

Fix TPC.v4 for qunatizing merge-ops weights per-tensor.
Fix keras_model_builder.py got merge-ops with quantized weights.

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• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
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• I have added new unittest (if necessary).