Setting up a libadbd flag for shared usage across miniadbd (CL 1/2) am: 3c01530eb7 am: fa8859ab46

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/adb/+/16468553

Change-Id: Ia7dcbfb6f5d5b5d195407e40d629a63befc79d37