IB/ehca: Change query_port() to return LINK_UP instead UNKNOWN

Set the port phys state as returned from ehca_query_port() to LINK_UP.
ehca actually represents a logical HCA, whose phys/link state always
is LINK_UP.

Signed-off-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>