exynos: Simplify calling of exynos_dp_phy_ctrl()

This function controls enabling the EDP PHY. Rename it and drop the existing
weak functions, which are confusing.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/mach-exynos/include/mach/power.h b/arch/arm/mach-exynos/include/mach/power.h
index 3f97b31..88f70d9 100644
--- a/arch/arm/mach-exynos/include/mach/power.h
+++ b/arch/arm/mach-exynos/include/mach/power.h
@@ -1717,7 +1717,7 @@
 #define POWER_USB_DRD_PHY_CTRL_EN		(1 << 0)
 #define POWER_USB_DRD_PHY_CTRL_DISABLE		(0 << 0)
 
-void set_dp_phy_ctrl(unsigned int enable);
+void exynos_dp_phy_ctrl(unsigned int enable);
 
 #define EXYNOS_DP_PHY_ENABLE		(1 << 0)