Add OWNERS for systemui tests for /stylus and /notetask.

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2361940

Change-Id: Id02cbb5e7adac17bebb20044e8175dc0339fd4f6
Merge-Id: Id02cbb5e7adac17bebb20044e8175dc0339fd4f6
2 files changed