Merge "Rename system/core/rootdir/Android.mk to create_root_structure.mk" into...

Merge "Rename system/core/rootdir/Android.mk to create_root_structure.mk" into main am: 1024225b am: 089049b6

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3261831



Change-Id: Ief60db66527cb28933c4134dfd91a645385b0fd1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>