Revert D23584071: [dper3] Create dper LearningRate low-level module
Test Plan: revert-hammer
Differential Revision:
D23584071 (https://github.com/pytorch/pytorch/commit/a309355be3d2c12dfdca17ee34a8259654c5b823)
Original commit changeset: f6656531b1ca
fbshipit-source-id: b0a93f4286053fb8576a70278edca3a7d89c722b
