Fix fake fusion for convolutions without bias

[balakrishnanv]

Summary: Fix AttributeError when performing fake fusion on convolution layers without bias by creating a zero-filled bias parameter instead of attempting to access requires_grad on None.

Differential Revision: D87356763

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3353

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