Move plugin definition to plugin library

Bug: 229771520
Test: No new tests, just a package change
Change-Id: I591c337f8f6062befdb2a08f61a1456c5af04be3
(cherry picked from commit 14f67f4d7445ea39cbe99a285ed888cedfc17e21)
Merged-In: I591c337f8f6062befdb2a08f61a1456c5af04be3
4 files changed