Shutdown f2fs to avoid fsck am: 7e0df03bc9

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/18095143

Change-Id: Ib8760b2d14a3e852cc4b001b9edf0b381ba605d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>