anv/gem: Use EXECBUFFER2_WR when the FENCE_OUT flag is set

Reviewed-by: Chad Versace <chadversary@chromium.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_gem.c

 anv_gem_execbuffer(struct anv_device *device,
                    struct drm_i915_gem_execbuffer2 *execbuf)
 {
-   return anv_ioctl(device->fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf);
+   if (execbuf->flags & I915_EXEC_FENCE_OUT)
+      return anv_ioctl(device->fd, DRM_IOCTL_I915_GEM_EXECBUFFER2_WR, execbuf);
+   else
+      return anv_ioctl(device->fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf);
 }
 
 int