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: Chunfeng Yun <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

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

···
 	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);