Cache return value of waitForService am: f990908371 am: e3c22ac6c6 am: 2288eddf2e

Original change: https://android-review.googlesource.com/c/platform/system/gsid/+/2816418

Change-Id: I592f1212f7da41a5141677dbfd8911c7c9948d80
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>