Fix structured kernel codegen (#49244)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49244
see https://fb.quip.com/ceEdANd5iVsO
RegisterMkldnnCPU kernels incorrectly used makeUnboxedOnly() calls to register add_.Tensor kernels. This is because the codegen incorrectly thought they're not c10-full.
This PR fixes that.
ghstack-source-id: 118411117
Test Plan: After this PR, RegisterMkldnnCPU doesn't contain the makeUnboxedOnly() calls anymore.
Reviewed By: ezyang
Differential Revision: D25500246
fbshipit-source-id: 8a8c2be9c4f4a5ce7eaae94257c2f8cbd176e92e
