phy: lantiq: rcu-usb2: Constify ltq_rcu_usb2_phy_ops

The only usage is to pass its address to devm_phy_create() which takes a
const pointer. Make it const to allow the compiler to put it in
read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20200823220025.17588-5-rikard.falkeborn@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/lantiq/phy-lantiq-rcu-usb2.c

@@ -141,7 +141,7 @@ static int ltq_rcu_usb2_phy_power_off(struct phy *phy)
 	return 0;
 }
 
-static struct phy_ops ltq_rcu_usb2_phy_ops = {
+static const struct phy_ops ltq_rcu_usb2_phy_ops = {
 	.init		= ltq_rcu_usb2_phy_init,
 	.power_on	= ltq_rcu_usb2_phy_power_on,
 	.power_off	= ltq_rcu_usb2_phy_power_off,