r600g: fix streamout on evergreen

Enable it in the evergreen_context_draw if needed.
Same as already done in the r600_context_draw for r6xx/r7xx.

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed