Adding min_sdk_version to libgrpc_bindgen am: ead5592d57 am: f4b2eb0972 am: 2c81e863bf

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-sys/+/1966312

Change-Id: I33117a0a821c8f3056ec60e3c0194b41ee7f740a