Merge "Adding FileSystemUtilsTests to postsubmit" into main am: bd161c547e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3042793

Change-Id: I52be58c2d4455a37982fcadc6de31b8403d3e071
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>