thunderbolt: Use correct error code with ERROR_NOT_SUPPORTED

We check for -EOPNOTSUPP but tb_xdp_handle_error() translated it to
-ENOTSUPP instead which is dealt as "transient" error and retried after
a while. Fix this so that we bail out early when the other side clearly
tells us it is does not support this.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>