Revert D35009111: [quant][gpu][core] Implemented quantized add operator using cudnn
Test Plan: revert-hammer
Differential Revision:
D35009111
Original commit changeset: 13afa7f0192f
Original Phabricator Diff: D35009111
fbshipit-source-id: 542f4c332d3ee35c2157461b50dd716286f27cf0
(cherry picked from commit 124605544b76208874c38f165698393a831d8c8e)
