Revert D26655616: [quant][graphmode][fx] Add support for fp16 bmm pattern
Test Plan: revert-hammer
Differential Revision:
D26655616 (https://github.com/pytorch/pytorch/commit/2c44b256d88143e07d65bf9a5023e100d12b412d)
Original commit changeset: 1d0639303e5c
fbshipit-source-id: 403429c706c8a9e6a657669daf8aadf282025f83
