[not4land][quant][fx][graphmode] lower reference linear module example (#65723)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65723
Example lowering reference linear module to fbgemm/qnnpack quantized linear module
Test Plan: Imported from OSS
Reviewed By: vkuzo
Differential Revision: D31567461
fbshipit-source-id: 0b8fffaf8e742ec15cb07bf6a4672cf3e856db2d
