drm/amdgpu: enable GFX clock gating for beige_goby

Enable GFX MGCG, CGCG and 3DCG for beige_goby.

Signed-off-by: Tao Zhou <[e-mail]>
Reviewed-by: Jiansong Chen <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 		adev->external_rev_id = adev->rev_id + 0x3c;
 		break;
 	case CHIP_BEIGE_GOBY:
-		adev->cg_flags = 0;
+		adev->cg_flags = AMD_CG_SUPPORT_GFX_MGCG |
+			AMD_CG_SUPPORT_GFX_CGCG |
+			AMD_CG_SUPPORT_GFX_3D_CGCG;
 		adev->pg_flags = AMD_PG_SUPPORT_VCN |
 			AMD_PG_SUPPORT_VCN_DPG;
 		adev->external_rev_id = adev->rev_id + 0x46;