USB: serial: io_ti: always require a bulk-out endpoint

These devices always require at least one bulk-out endpoint so let core
verify that.

This avoids attempting to send bulk data to the default pipe when
downloading firmware in boot mode.

Note that further endpoints are still needed when not in boot mode.
Signed-off-by: NJohan Hovold <johan@kernel.org>

drivers/usb/serial/io_ti.c

@@ -2747,6 +2747,7 @@ static struct usb_serial_driver edgeport_1port_device = {
 	.description		= "Edgeport TI 1 port adapter",
 	.id_table		= edgeport_1port_id_table,
 	.num_ports		= 1,
+	.num_bulk_out		= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,
@@ -2785,6 +2786,7 @@ static struct usb_serial_driver edgeport_2port_device = {
 	.description		= "Edgeport TI 2 port adapter",
 	.id_table		= edgeport_2port_id_table,
 	.num_ports		= 2,
+	.num_bulk_out		= 1,
 	.open			= edge_open,
 	.close			= edge_close,
 	.throttle		= edge_throttle,