phy: hisilicon; Constify hi3660_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/20200823220025.17588-4-rikard.falkeborn@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/hisilicon/phy-hi3660-usb3.c

@@ -161,7 +161,7 @@ static int hi3660_phy_exit(struct phy *phy)
 	return ret;
 }
 
-static struct phy_ops hi3660_phy_ops = {
+static const struct phy_ops hi3660_phy_ops = {
 	.init		= hi3660_phy_init,
 	.exit		= hi3660_phy_exit,
 	.owner		= THIS_MODULE,