usb: typec: fusb302: Populate tcpc fwnode for TCPM property handling

This update populates the tcpc handle's fwnode pointer with the
child usb-connector node, if it exists, so that TCPM can perform
generic property handling to define the ports capabilities.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>