[mlir][tensor] Bufferize tensor.reshape with non-identity layouts (#65654)

Bufferization of tensor.reshape generates a memref.reshape operation.
memref.reshape requires the source memref to have an identity layout.
The bufferization process may result in the source memref having a
non-identity layout, resulting in a verification failure.

This change causes the bufferization interface for tensor.reshape to
copy the source memref to a new buffer when the source has a
non-identity layout.