Merge "Export partition-related variables to soong" into main am: ae332aea96

Original change: https://android-review.googlesource.com/c/platform/build/+/3273935

Change-Id: Id91a037753a16ca251151de82689b5eb199d03ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>