staging: typec: Type-C Port Controller Interface driver (tcpci)

The port controller interface driver interconnects the Type-C Port
Manager with a Type-C Port Controller Interface (TCPCI) compliant
port controller.

Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>