phy: fsl-imx8mq-usb: Constify imx8mq_usb_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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/freescale/phy-fsl-imx8mq-usb.c

···
 	return 0;
 }
 
-static struct phy_ops imx8mq_usb_phy_ops = {
+static const struct phy_ops imx8mq_usb_phy_ops = {
 	.init		= imx8mq_usb_phy_init,
 	.power_on	= imx8mq_phy_power_on,
 	.power_off	= imx8mq_phy_power_off,