Try to recover corrupted ext4 /data with backup superblock am: 4e864e12 am: 9bbce096 am: 4ffb1ff6 am: 2cf87de9

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/11835152

Change-Id: Ia5b19cc9153b92bb1d489386018bf1c1fcf4426a