[mlir][Linalg] Handle fusion on tensors for projected permutation.

In the past, the reshape op can be folded only if the indexing map is
permutation in consumer's usage. We can relax to condition to be projected
permutation.

This patch still limits the fusion for scalar cases. Scalar case is a corner
case, because we need to decide where to put extra dims.

Reviewed By: mravishankar

Differential Revision: https://reviews.llvm.org/D92466