thunderbolt: Add missing kernel-doc parameter descriptions

Two functions that were added for USB4 support miss kernel-doc parameter
descriptions so add them now.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20200214121638.75589-1-mika.westerberg@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>