drm/amdgpu: allow TMZ on vangogh

Uses the same pathes as navi.
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -393,6 +393,7 @@ void amdgpu_gmc_tmz_set(struct amdgpu_device *adev)
 	case CHIP_NAVI10:
 	case CHIP_NAVI14:
 	case CHIP_NAVI12:
+	case CHIP_VANGOGH:
 		/* Don't enable it by default yet.
 		 */
 		if (amdgpu_tmz < 1) {