Make proc-macro-error-attr available to product and vendor am: e720490b44

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/proc-macro-error-attr/+/2476392

Change-Id: Ic7b5411d36bf894e28bddcf69afe55deb85880a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>