Revert D30732630: [quant] Enable jit tracing on quantizable LSTM
Test Plan: revert-hammer
Differential Revision:
D30732630 (https://github.com/pytorch/pytorch/commit/116142143cc2d66c7e582d9f96e00862456fd736)
Original commit changeset: 443e351ebb0e
fbshipit-source-id: 49001392f01366f3b1ccc31139f824c80b86cd40
