tpm: add and enable SNP SVSM vTPM driver

Merge Request Required Information

Summary of Changes

This is a backport of https://lore.kernel.org/linux-integrity/20250410135118.133240-1-sgarzare@redhat.com/

Add driver for the vTPM defined by the AMD SVSM spec needed for Confidential VMs. And enable it in the configuration.

Signed-off-by: Stefano Garzarella sgarzare@redhat.com

Approved Development Ticket(s)

All submissions to CentOS Stream must reference a ticket in Red Hat Jira.

JIRA: https://issues.redhat.com/browse/RHEL-87276

Resolves: RHEL-87276

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