Reorder mmt4d shapes:

* Revert https://reviews.llvm.org/D107307 so that both LHS and RHS have
  the same layout with K0 as the innermost dimension.

* Continuing from https://reviews.llvm.org/D107003, move also 'K'
  to the outer side, so that now the inter-tile dimensions as all outer,
  and the intra-tile dimensions are all inner.

Reviewed By: asaadaldien

Differential Revision: https://reviews.llvm.org/D109692