gsid: Make enableGsi() idempotent am: d646d79c4f am: 448be92d3c am: db6cd05741 am: 1f83bd3f4e

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

Change-Id: I97b437d296511a11f0934b2d83877f167a73958c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>