thunderbolt: Do not touch lane 1 adapter path config space

It is not required to be implemented at all because USB4 does not use
lane 1 for tunneling except when aggregated with lane 0. For this reason
do not try to read the path config space of USB4 lane 1 adapters.

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