Reorder mmt4d r.h.s operand layout

Switch r.h.s operand layout (n1, k1, n0, k0) -> (n1, k1, k0, n0)
which is more consistant with scalar-vector products vectorization
and elementates operand transpose.

Reviewed By: rsuderman

Differential Revision: https://reviews.llvm.org/D107307