usb: typec: tps6598x: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tps6598x.c

@@ -403,6 +403,7 @@ static int tps6598x_probe(struct i2c_client *client)
 	case TPS_PORTINFO_DRP_UFP_DRD:
 	case TPS_PORTINFO_DRP_DFP_DRD:
 		tps->typec_cap.dr_set = tps6598x_dr_set;
+		/* fall through */
 	case TPS_PORTINFO_DRP_UFP:
 	case TPS_PORTINFO_DRP_DFP:
 		tps->typec_cap.pr_set = tps6598x_pr_set;