phy: phy-mtk-dp: change mtk_dp_phy_driver to static

mtk_dp_phy_driver is only used in phy-mtk-dp.c now, change it to static.

Signed-off-by: Yang Yingliang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/mediatek/phy-mtk-dp.c

···
 	return 0;
 }
 
-struct platform_driver mtk_dp_phy_driver = {
+static struct platform_driver mtk_dp_phy_driver = {
 	.probe = mtk_dp_phy_probe,
 	.driver = {
 		.name = "mediatek-dp-phy",