Revert^2 "add crate_root property to rust modules" am: 60375c4a am:...

Revert^2 "add crate_root property to rust modules" am: 60375c4a am: 73f5aae5 am: 1aeb848c am: 6c84d29f am: ff6f08e9

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2746467



Change-Id: Idd17ef13d8c8182a0a8b575f3cc99ecea04c7f2e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>