Add a NULL implementation of the library class TpmPlatformHierarchyLib. Link: https://bugzilla.tianocore.org/show_bug.cgi?id=3510 Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Sami Mujawar <sami.mujawar@arm.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>