Merge "rust: set ANDROID_RUST_VERSION based on prebuilts" am: 5e745599 am:...

Merge "rust: set ANDROID_RUST_VERSION based on prebuilts" am: 5e745599 am: c07e7e9f am: eca7fc2f

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2062367



Change-Id: I8438e0502763d0b3bf5d4e6f4565e9811ad735f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>