phy: phy-mtk-tphy: keep default value of mcu_bus_ck_gate_en

The default value of mcu_bus_ck_gate_en is 1, if clear it, will
prevent system to enter deep idle mode, so keep its default value
and without affecting PCIe function.
Signed-off-by: NChunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>

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

@@ -688,8 +688,7 @@ static void pcie_phy_instance_power_on(struct mtk_tphy *tphy,
 	u32 tmp;
 
 	tmp = readl(bank->chip + U3P_U3_CHIP_GPIO_CTLD);
-	tmp &= ~(P3C_FORCE_IP_SW_RST | P3C_MCU_BUS_CK_GATE_EN |
-		P3C_REG_IP_SW_RST);
+	tmp &= ~(P3C_FORCE_IP_SW_RST | P3C_REG_IP_SW_RST);
 	writel(tmp, bank->chip + U3P_U3_CHIP_GPIO_CTLD);
 
 	tmp = readl(bank->chip + U3P_U3_CHIP_GPIO_CTLE);