gsid: Make enableGsi() idempotent am: d646d79c4f am: 448be92d3c am: db6cd05741

Original change: https://android-review.googlesource.com/c/platform/system/gsid/+/2054425

Change-Id: I0e8e1fcfb681e5444f95e54ab6b058311be7b303
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>