Revert^3 "add crate_root property to rust modules" am: 9c64274b am:...

Revert^3 "add crate_root property to rust modules" am: 9c64274b am: fb469c9f am: 8a0472a5 am: 638e4eb0

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2760292



Change-Id: I4ee7a5705bec7a246858009d64e84ce29f491aa2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>