Fix cargo2android. am: 2a78f125fb

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-sys/+/2855615

Change-Id: I26ed1ce1d3c7b1ed2e7fdeb7098ddc6f217c502a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>