Remove ::kernels for namespacing

[syedshazli]

This PR addresses a TODO in torchao\csrc\cpu\torch_free_kernels\fallback\matmul\fp32_a_channelwise_8bit_b_fp32_c.h which says "TODO: Remove all ::kernels. No need for extra namespace."

I presume this meant remove all namespaces within the codebase that reference ::kernels, which is why this commit is so large. If this is not the case and was only meant for the .h file, I can change the commit to reflect this.

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