New GCM commands implemented

- NV4097_SET_DEPTH_BOUNDS_MIN
- NV4097_SET_POLY_OFFSET_FILL_ENABLE
- NV4097_SET_POLY_OFFSET_LINE_ENABLE
- NV4097_SET_POLY_OFFSET_POINT_ENABLE
- NV4097_SET_RESTART_INDEX_ENABLE
- NV4097_SET_RESTART_INDEX