Add function to reverse 4bit weights for HPU by vivekgoe · Pull Request #1757

Add function to reverse 4bit weights for HPU by vivekgoe · Pull Request #1757 · bitsandbytes-foundation/bitsandbytes

Fixes following failure for HPU/Gaudi tests,
ImportError: cannot import name '_reverse_4bit_compress_format' from 'bitsandbytes.utils' (/usr/local/lib/python3.10/dist-packages/bitsandbytes/utils.py)

Fix is to define this function within backends/hpu/ops.py. This function is needed to maintain backward compatibility with older Gaudi SW releases.