Store bias in PackedLinearWeight struct in fbgemm (#25428)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25428
Added bias as an optional param to the quantized_linear_prepack function.
Bias is quantized during runtime using input scale and weight scale.
ghstack-source-id: 89601399
Test Plan: python test/run_test.py --exclude nn --verbose --bring-to-front quantization quantized quantized_tensor quantized_nn_mods quantizer
Differential Revision: D17121304
fbshipit-source-id: 8adb0e55e4aed0a5430aaa2c8639c8ad1639c85a
