usb: renesas_usbhs: silence a gcc warning

Gcc complains about this printk:
drivers/usb/renesas_usbhs/mod_gadget.c:188:3: warning: format ‘%x’
	expects argument of type ‘unsigned int’, but argument 3 has type
	‘dma_addr_t’ [-Wformat]

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>