Revert^4 "add crate_root property to rust modules" am: 63ca14e9 am:...

Revert^4 "add crate_root property to rust modules" am: 63ca14e9 am: cff79b52 am: 1cc92cae am: 91f0649c am: 36c12be2

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2761806



Change-Id: I55db5db490c4cdd1eb11cf11594de1963b37a547
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>