Remove Customized SecureBoot Mode transition logic for Mantis 1263, including AuditMode/DeployedMode/PK update management.
Also remove image verification logic in AuditMode.
The feature has been moved to
https://github.com/tianocore/edk2-staging/tree/Customized-Secure-Boot
Previous check-in hash is
SHA-1: 4fc08e8d683522f255727626197d919a40d4836c