[build][cmx] Restore target to .cmx allowlist

fxrev.dev/692397 incorrectly removed a target from the allowlist.

The component is being migrated to CFv2: fxrev.dev/686366

Change-Id: Ia2378bc3b20bcb2cf962fd08b7400cab806dc5e8
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/693822
Reviewed-by: Shai Barack <shayba@google.com>
Commit-Queue: Allan MacKinnon <allanmac@google.com>
diff --git a/build/components/cmx/BUILD.gn b/build/components/cmx/BUILD.gn
index 2a8fc9ae..83cded4 100644
--- a/build/components/cmx/BUILD.gn
+++ b/build/components/cmx/BUILD.gn
@@ -224,6 +224,7 @@
     "//src/graphics/lib/compute/radix_sort/platforms/vk/tests/radix_sort_vk_bench:*",
     "//src/graphics/lib/compute/radix_sort/platforms/vk/tests/radix_sort_vk_bench/tests:*",
     "//src/graphics/lib/compute/spinel-vk-rs/tests:*",
+    "//src/graphics/lib/compute/spinel/platforms/vk/tests/spinel_vk_bench:*",
     "//src/graphics/lib/compute/spinel/platforms/vk/tests/spinel_vk_tests:*",
     "//src/graphics/lib/compute/tools/bench/platforms/vk:*",
     "//src/graphics/lib/compute/tools/bench/platforms/vk/tests:*",