Remove K and N function arguments for fbgemm_pack_quantized_matrix (#22956)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22956
As Title says: remove the extra function arguments for better engineering.
Differential Revision: D16297724
fbshipit-source-id: a31be17708d13508c4ce9a3ce7eb5238e8d17984