usb: phy: remove unused APIs from Tegra PHY.

As tegra_usb_phy_clk_disable/enable() are not being
used, removing them.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

drivers/usb/phy/tegra_usb_phy.c

@@ -825,16 +825,3 @@ void tegra_ehci_phy_restore_end(struct tegra_usb_phy *phy)
 }
 EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_end);
 
-void tegra_usb_phy_clk_disable(struct tegra_usb_phy *phy)
-{
-	if (!phy_is_ulpi(phy))
-		utmi_phy_clk_disable(phy);
-}
-EXPORT_SYMBOL_GPL(tegra_usb_phy_clk_disable);
-
-void tegra_usb_phy_clk_enable(struct tegra_usb_phy *phy)
-{
-	if (!phy_is_ulpi(phy))
-		utmi_phy_clk_enable(phy);
-}
-EXPORT_SYMBOL_GPL(tegra_usb_phy_clk_enable);