MAINTAINERS: Cover tpm.c again
Commit 800d4deda0 "softmmu: move more files to softmmu/" (v5.2.0)
updated MAINTAINERS for all moved files but one. Fix that.
Fixes: 800d4deda04be016a95fbbf397c830a2d14ff9f6
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230120170104.359690-1-armbru@redhat.com>