phy: allwinner: phy-sun6i-mipi-dphy: Constify structs

sun6i_dphy_ops and sun6i_dphy_regmap_config are not modified so make them
const structs to allow the compiler to put them in read-only memory.

Before:
   text    data     bss     dec     hex filename
   4407    1944      64    6415    190f drivers/phy/allwinner/phy-sun6i-mipi-dphy.o

After:
   text    data     bss     dec     hex filename
   4835    1496      64    6395    18fb drivers/phy/allwinner/phy-sun6i-mipi-dphy.o
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20200629195727.9717-1-rikard.falkeborn@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/allwinner/phy-sun6i-mipi-dphy.c

@@ -233,7 +233,7 @@ static int sun6i_dphy_exit(struct phy *phy)
 }
 
 
-static struct phy_ops sun6i_dphy_ops = {
+static const struct phy_ops sun6i_dphy_ops = {
 	.configure	= sun6i_dphy_configure,
 	.power_on	= sun6i_dphy_power_on,
 	.power_off	= sun6i_dphy_power_off,
@@ -241,7 +241,7 @@ static struct phy_ops sun6i_dphy_ops = {
 	.exit		= sun6i_dphy_exit,
 };
 
-static struct regmap_config sun6i_dphy_regmap_config = {
+static const struct regmap_config sun6i_dphy_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
 	.reg_stride	= 4,