Revert "Let a serialized fake-tensor state_dict be read back (#22111)"

[ThomasJannaud]

Reverts #22111

this needs to be merged on phabricator

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[ThomasJannaud]

#22111 didn't need to be reverted, this was just because phabricator started to complain I didn't merge it internally first, but it's now solved on phabricator. So no need to revert