Update README for TestWakeupClientServer. am: 1b66644304 am: 2904d54014 am: e0ada0cfcc

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2271981

Change-Id: I417fe5d45b93462fbfeb9ca30328d4b043b77b4d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>