Merge "Use x86_64-unknown-linux-gnu for host cargo build" am: b7fe32ea2d am: ea28768000 am: dc50ffc2da am: 98398c0c0e

Original change: https://android-review.googlesource.com/c/platform/development/+/1444756

Change-Id: I064af7937fd97c19e1e9307eae1eb2c9ceecca6b