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

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

Change-Id: I446106848249e2c6a89292e5a516404af5725150
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>