phy: Constify struct phy_ops variables

The phy_ops variables are never modified after initialized in these
drivers, so make them const.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
diff --git a/drivers/phy/phy-miphy28lp.c b/drivers/phy/phy-miphy28lp.c
index 677c290..c47b56b 100644
--- a/drivers/phy/phy-miphy28lp.c
+++ b/drivers/phy/phy-miphy28lp.c
@@ -1132,7 +1132,7 @@
 	return miphy_phy->phy;
 }
 
-static struct phy_ops miphy28lp_ops = {
+static const struct phy_ops miphy28lp_ops = {
 	.init = miphy28lp_init,
 	.owner = THIS_MODULE,
 };