arm:dts: Fix USB3503 detection
The device samples the INT_N pin to switch between two sets of reference clock speeds. To support this change the pin to active_high.
See 3.3.3 in the USB3503 datasheet. http://ww1.microchip.com/downloads/en/DeviceDoc/00001584.pdf
BCS 746-000255 BCS 746-000360 BCS 746-000359