Blender Git Loki

Cleanup: Stop accessing gpu_batch_presets_reset()

The current code is accessing this from outside the gpu "namespace". As
such it should be accessing GPU_ functions, not gpu_ functions.

This is also a place to centralize the XXX message that will be
addressed upon refactor. So we can reuse this call in other places that
need the same temporary workaround.

Groundwork for upcoming fix (D8472)