Revert^2 "Add deleteAllKeys to IKeystoreMaintenance" am: 93b6f681e5 am: c5d4b5da6f

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/security/+/15547744

Change-Id: If561d557d69899c1a5c8f2546562c1c9074e1962