usb: mtu3: fix ip sleep auto-exit issue when enable DRD mode

Ip sleep will auto exit if vbus comparison circuit of u2 phy is
disabled when system tries to enter suspend mode, so get vbus-valid
status from mac but not from u2 phy when enable DRD mode to fix
the issue.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/mtu3/mtu3_hw_regs.h

@@ -462,10 +462,12 @@
 #define SSUSB_U3_PORT_DIS		BIT(0)
 
 /* U3D_SSUSB_U2_CTRL_0P */
+#define SSUSB_U2_PORT_VBUSVALID	BIT(9)
 #define SSUSB_U2_PORT_OTG_SEL		BIT(7)
-#define SSUSB_U2_PORT_HOST_SEL		BIT(2)
+#define SSUSB_U2_PORT_HOST		BIT(2)
 #define SSUSB_U2_PORT_PDN		BIT(1)
 #define SSUSB_U2_PORT_DIS		BIT(0)
+#define SSUSB_U2_PORT_HOST_SEL	(SSUSB_U2_PORT_VBUSVALID | SSUSB_U2_PORT_HOST)
 
 /* U3D_SSUSB_DEV_RST_CTRL */
 #define SSUSB_DEV_SW_RST		BIT(0)