dts: s32cc: usb phy driver switch to ulpi generic

Since a new usb phy driver for ulpi otg phys is introduced, we switch to
it instead of using "Nop USB Transceiver driver". This is because that
we shouldn't rely on the usb phy initialization in u-boot.

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>