Add Android.bp and TEST_MAPPING am: 692021126c am: dc50080ef8 am: be17ba1591 am: 67f8e83d33

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/syn-mid/+/1330027

Change-Id: Iae97dda210a03c730ba712d73547b250c593cebf