tpm: Make chip->{status,cancel,req_canceled} opt

tpm_ftpm_tee does not require chip->status, chip->cancel and
chip->req_canceled. Make them optional.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>