fix failing rust_aconfig_library test am: 521eb20d am: 30a59149 am: 090e75b4

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2757201



Change-Id: Icc8e5bbe7d80107cbc6c16b7e4bf300278c606e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>