* Added methods and placeholders for checking the supply chain for base and delta credentials according to the new TCG spec
Checkstyle changes
Created a new SupplyChainValidation.ValidationType for delta credential attributes. The existing PLATFORM_CREDENTIAL
ValidationType will be used for both base and delta platform credentials from spec 1.1.
* Checkstyle error: trailing spaces
Added an additional null check for a platform supply validation. Added a mapping object for platform credential to the associated attributes during validations.
Added an additional null check for a platform supply validation. Added a mapping object for platform credential to the associated attributes during validations. Missed import statement.
