#13875: fix tilize and attn matmul on BH

[bbradelTT]

Ticket

Link to Github Issue #13875

Problem description

• there were issues with attn matmul ops on BH

What's changed

• updated llk commit
• reverted z dim in tilize uninit
• moved untilize init earlier

Checklist

• Post commit CI passes https://github.com/tenstorrent/tt-metal/actions/runs/12050639818
• Blackhole Post commit (if applicable) https://github.com/tenstorrent/tt-metal/actions/runs/12050643335
• Model regression CI testing passes (if applicable) fails in the same way as main https://github.com/tenstorrent/tt-metal/actions/runs/12050659167 vs https://github.com/tenstorrent/tt-metal/actions/runs/12045311806
• Device performance regression CI testing passes (if applicable) Unrelated flakiness https://github.com/tenstorrent/tt-metal/actions/runs/12050647494 waiting for re-run. Re-run succeeded
• New/Existing tests provide coverage for changes

Based on main...nvelickovic/fix_attn_matmul