thunderbolt: Do not unnecessarily call ICM get route

This command is not really fast and can make resume time slower. We only
need to get route again if the link was changed and during initial
device connected message.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>