Merge "Preserve environment when launching overlay_remounter" into main am: 3250a0a2

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3503057



Change-Id: Ief9c1fd3c0cad85283d1d635686a5b3fc0f6f0e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>