Suppress new VVL error

This VVL check seems either impossible to satisfy, or difficult due to
underspecification of the error in the Vulkan spec.

Bug: angleproject:7513
Change-Id: I82873fb41aa7f03413114ed6672ba2bebd98f009
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/96982
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>

src/dawn/native/vulkan/BackendVk.cpp

@@ -82,6 +82,10 @@ constexpr SkippedMessage kSkippedMessages[] = {
      "stencil aspect during store with stencilStoreOp VK_ATTACHMENT_STORE_OP_STORE. Access info "
      "(usage: SYNC_LATE_FRAGMENT_TESTS_DEPTH_STENCIL_ATTACHMENT_WRITE, prior_usage: "
      "SYNC_FRAGMENT_SHADER_SHADER_STORAGE_READ, read_barriers: VK_PIPELINE_STAGE_2_NONE"},
+
+    // http://anglebug.com/7513
+    {"VUID-VkGraphicsPipelineCreateInfo-pStages-06896",
+     "contains fragment shader state, but stages"},
 };
 
 namespace dawn::native::vulkan {