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

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

Change-Id: Ib166962a5faa8e5b7b8c4caa1c90e3e339a232c4