venus: stub out renderer sync_fd fencing features

With syncFdFencing feature, venus starts forwarding renderer sync_fd
fencing support. The driver side now can track the renderer sync_fd
fencing features. This change adds the initial stubs.

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17975>

src/virtio/vulkan/vn_instance.c

@@ -224,10 +224,12 @@ vn_instance_init_experimental_features(struct vn_instance *instance)
              "VkVenusExperimentalFeatures100000MESA is as below:"
              "\n\tmemoryResourceAllocationSize = %u"
              "\n\tglobalFencing = %u"
-             "\n\tlargeRing = %u",
+             "\n\tlargeRing = %u"
+             "\n\tsyncFdFencing = %u",
              instance->experimental.memoryResourceAllocationSize,
              instance->experimental.globalFencing,
-             instance->experimental.largeRing);
+             instance->experimental.largeRing,
+             instance->experimental.syncFdFencing);
    }
 
    return VK_SUCCESS;