usb: add USB_SPEED_SUPER_PLUS

Add enum USB_SPEED_SUPER_PLUS for USB3.1

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index d4ae186..76f5a9c 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -46,6 +46,7 @@
 	[USB_SPEED_HIGH] = "high-speed",
 	[USB_SPEED_WIRELESS] = "wireless",
 	[USB_SPEED_SUPER] = "super-speed",
+	[USB_SPEED_SUPER_PLUS] = "super-speed-plus",
 };
 
 enum usb_device_speed usb_get_maximum_speed(ofnode node)