Merge "Upgrade protobuf to 3.2.0" am: 7dc275cd70 am: 9b9bcfecdd am: 7341fcb745

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf/+/2520001

Change-Id: I382314fb421087ddca1e190af79a75da4496a2d0
Signed-off-by: Automerger Merge Worker <[email protected]>