Fix the depthwise 3x3x3 fast path criteria for the stride (#19692)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19692
Remove the requirement on stride for the optimized depthwise 3x3x3 kernels.
Reviewed By: jspark1105
Differential Revision: D15070214
fbshipit-source-id: 9fe2d8e96930166e4eb0e2dd2288f6a0c4831e0a
