Handle 1D input for xnnpack::linear (#54986)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54986
If the input is 1D xnnpack::linear fails while aten::linear makes it (1, D) and continues
Test Plan: buck test //caffe2/test:xnnpack_integration -- TestXNNPACKOps
Reviewed By: kimishpatel
Differential Revision: D27441966
fbshipit-source-id: dfb2c23b91247632e0e3fd2482056a503c246c39
