[X86][TTI] Finish costmodel for AVX512BW's VPMOVM2[BW] / VPMOV[BW]2M instructions

Apparently my methodology was suboptimal, and not only did miss all the +VL tuples,
i also missed some plain tuples. I believe, this adds everything missing.
Indeed, these manual costmodels are just not okay long-term.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D114334