[quant][graphmode][fx][fix] Fix fp16 reference patterns for linear (#55727)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55727
number of dequantize for fp16 reference pattern was incorrect before, this
PR fixes the problem
Test Plan: Imported from OSS
Reviewed By: vkuzo
Differential Revision: D27713390
fbshipit-source-id: 72b8d4cda0bdcea74abe27a76f918d1b47819b01
