keystore2: log super key creation

Log an informational message when creating each of a user's super keys,
as these are significant events.

Bug: 296464083
Test: atest -p --include-subdirs system/security/keystore2
Flag: exempt, just adds a log message
Change-Id: I9d76a0ec06fae208412f4c6cf1b7dd739b023a61
2 files changed