Vulkan: Enable FenceNV extension without graph.

Bug: angleproject:4029
Change-Id: I6b3f469b692010e373b9c82b689966da98b8a6cc
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2065918
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

src/libANGLE/renderer/vulkan/vk_caps_utils.cpp

@@ -474,8 +474,7 @@ void RendererVk::ensureCapsInitialized() const
     mNativeExtensions.pixelBufferObjectNV = true;
 
     // Enable GL_NV_fence extension.
-    // TODO(jmadill): Enable without graph. http://anglebug.com/4029
-    mNativeExtensions.fenceNV = mFeatures.commandGraph.enabled;
+    mNativeExtensions.fenceNV = true;
 
     // Geometry shader is optional.
     if (mPhysicalDeviceFeatures.geometryShader)