Merge "[cargo2android.py] Reserve all lines before the first rust_* rule" am: dccb72a1a2 am: c974998cba am: ff0212e7ae

Original change: https://android-review.googlesource.com/c/platform/development/+/1645771

Change-Id: If14f1de89293f773ab7470cf24cea62250c28a61