net: ethernet: qualcomm: constify qca_serdev_ops

The only usage of qca_serdev_ops is to pass its address to
serdev_device_set_client_ops() which takes a const pointer. Make it
const to allow the compiler to put it in read-only memory.
Signed-off-by: NRikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/qca_uart.c

@@ -167,7 +167,7 @@ static void qca_tty_wakeup(struct serdev_device *serdev)
 	schedule_work(&qca->tx_work);
 }
 
-static struct serdev_device_ops qca_serdev_ops = {
+static const struct serdev_device_ops qca_serdev_ops = {
 	.receive_buf = qca_tty_receive,
 	.write_wakeup = qca_tty_wakeup,
 };