usb: gadget: lpc32xx_udc: Disable setup request error

This message is an debugging message. It's useful for finding protocol
details but it's not necessarily an error.

Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>