[FX] Make module getattr wrapper proxy buffers (#73612)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/73612
Test Plan: Imported from OSS
Reviewed By: zdevito
Differential Revision: D34568113
Pulled By: jamesr66a
fbshipit-source-id: 95a7106cf6ce45999c1b3c06b34965e725961771
(cherry picked from commit 54841e028478ea641fb4d7895f726553b8b48353)
