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In a subsequent patch, VFIO will need to recognize if a memory region owner is a TPM CRB device. Hence VFIO needs to use TPM_IS_CRB() even if CONFIG_TPM is unset. So let's add a stub function. Signed-off-by: Eric Auger <eric.auger@redhat.com> Suggested-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Stefan Berger <stefanb@linnux.ibm.com> Link: https://lore.kernel.org/r/20220506132510.1847942-2-eric.auger@redhat.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>