drm/amdgpu: add gfx clock gating support for dimgrey_cavefish

Set gfx clock gating for dimgrey_cavefish.
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Jiansong Chen <Jiansong.Chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -7686,6 +7686,7 @@ static int gfx_v10_0_set_clockgating_state(void *handle,
 	case CHIP_SIENNA_CICHLID:
 	case CHIP_NAVY_FLOUNDER:
 	case CHIP_VANGOGH:
+	case CHIP_DIMGREY_CAVEFISH:
 		gfx_v10_0_update_gfx_clock_gating(adev,
 						 state == AMD_CG_STATE_GATE);
 		break;