Merge "Use MIT license type, specified in Cargo.toml" am: 54ea0582f3 am: a75e2dec5a

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf-codegen/+/1467123

Change-Id: Ic9319f1e3e2435458b9d6521db14ed0f3bd18982