Revert "Replace remaining enforceXXX methods"

This reverts commit 2cc14d04.

Reason for revert: Factory reset function can not work
This was caused by the method getCallerIdentityOptionalAdmin().
When the component name is null and no active admin is found,
getCallerIdentity() should be called instead of throwing a
security exception.

Bug: 170057677
Change-Id: I46f181a5be5bf6cff7be6ea0f8965c4cd7be1f01