Dram streaming MM random PCC failures

[tt-aho]

[aliuTT]

I've nailed down a particular set of repros, listing all things I can think of in case it's very machine setup specific:

• commit ef728f594
• bh-glx-c06u0 bh galaxy in the exabox
  • ssh slurm-login.exabox.tenstorrent.com
  • srun -N 1 -p bh_pod_4x32_C56 --nodelist bh-glx-c06u02 --pty /bin/bash
• FW

To repro:

• pytest models/demos/deepseek_v3_b1/tests/unit_tests/test_broadcast_rms.py
• pytest models/demos/deepseek_v3_b1/tests/unit_tests/test_dram_streaming_matmul.py::test_dram_streaming_matmul[silu-1-7168-2048]