[quant][fix][ez] Fix quant_type classification for fp16, fp16 (#48073)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48073
Test Plan: Imported from OSS
Reviewed By: supriyar
Differential Revision: D25011799
fbshipit-source-id: a12f645d6be1c607898633225b02617283d37df1