drm/amdgpu/gfx9: add clockgating support for vega12

Same as vega10 and raven.
Acked-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NFeifei Xu <Feifei.Xu@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -3505,6 +3505,7 @@ static int gfx_v9_0_set_clockgating_state(void *handle,
 
 	switch (adev->asic_type) {
 	case CHIP_VEGA10:
+	case CHIP_VEGA12:
 	case CHIP_RAVEN:
 		gfx_v9_0_update_gfx_clock_gating(adev,
 						 state == AMD_CG_STATE_GATE ? true : false);