usb: typec: tcpm: move to SNK_UNATTACHED if sink removed for DRP

Per typec spec:
Figure 4-15 Connection State Diagram: DRP
Figure 4-16 Connection State Diagram: DRP with Accessory and Try.SRC
	    Support
Figure 4-17 Connection State Diagram: DRP with Accessory and Try.SNK
	    Support
DRP port should move to Unattached.SNK instead of Unattached.SRC if
sink removed.
Signed-off-by: Li Jun <jun.li@nxp.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/1582128343-22438-1-git-send-email-jun.li@nxp.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tcpm/tcpm.c

@@ -3680,8 +3680,12 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
 	case SRC_SEND_CAPABILITIES:
 	case SRC_READY:
 		if (tcpm_port_is_disconnected(port) ||
-		    !tcpm_port_is_source(port))
-			tcpm_set_state(port, SRC_UNATTACHED, 0);
+		    !tcpm_port_is_source(port)) {
+			if (port->port_type == TYPEC_PORT_SRC)
+				tcpm_set_state(port, SRC_UNATTACHED, 0);
+			else
+				tcpm_set_state(port, SNK_UNATTACHED, 0);
+		}
 		break;
 	case SNK_UNATTACHED:
 		if (tcpm_port_is_sink(port))