[DO NOT MERGE] Revert "Change UUID after database upgrade"

Revert submission 15398814

Reason for revert: b/195477363
Reverted Changes:
I4690c21e7:Redefine XATTR_UUID to XATTR_UUID_V2
I7936fff03:Change UUID after database upgrade

Change-Id: I2160de16db7ca43220120e7d4f757a4573a3289b
2 files changed