Revert D29940705: [fx2trt] Dynamic shape inference support
Test Plan: revert-hammer
Differential Revision:
D29940705 (https://github.com/pytorch/pytorch/commit/6b02ad5f8240e8ec628aa81a206b3264d97294ea)
Original commit changeset: 1eab53a8cfd5
fbshipit-source-id: 68150a193df6f11389b14a0e8224e1489b29ff0b
