Merge "Export userdata partition related variables to Soong" into main am:...

Merge "Export userdata partition related variables to Soong" into main am: e7e27fb3 am: 27d12b58

Original change: https://android-review.googlesource.com/c/platform/build/+/3446211



Change-Id: I4ab5f0f99aa47d26c44b624da1a5548e355c4f16
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>