Merge "Add targets to build doc-stubs for non-updatable" into sc-dev am: 714f840a am: 24181d42 am: 51d1461b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14467998

Change-Id: I4cfa228ee27a4a66992c667c373f83236d8c5797