Add device_interface to the list of things that unpack_buffers puts in scope if used.
Add device_interface to the list of things that unpack_buffers puts in
scope if used.

kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide