usb: musb: JZ4770: Fix compilation with USB_MUSB_PERIPHERAL_HOTPLUG

It doesn't work, but at least the config option is now in the right
place again and the code compiles when it's enabled.
usb: musb: JZ4770: Properly request USB OTG ID pin and log its state

Now it shows up properly in debugfs.
And it now logs the pin state, which is also useful for debugging.