Merge "Provide mechanism for on demand loading/unloading of connected plugins" into udc-dev am: 9b6df5a9 am: 572bb9ba

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21990123



Change-Id: Ieceb33fea1b9359bb5f11ccb8308f35a47f5787b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>