Add FSTAB_OWNERS and update OWNERS to include Android.bp am: 70b62a2bcd

Original change: https://android-review.googlesource.com/c/device/google/gs-common/+/3205326

Change-Id: I2020275cf385bbdc63e2015ed2a91dfafb440c60
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>