usb: musb: dsps: don't fake of_node to musb core

If we pass our own of_node to musb_core, at least
pinctrl settings will be duplicated, meaning that
pinctrl framework will try to select default pin
state for musb_core when they were already requested
by musb-dsps.

A Warning will be printed however things will still
work.
Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_dsps.c

@@ -697,7 +697,6 @@ static int dsps_create_musb_pdev(struct dsps_glue *glue,
 	musb->dev.parent		= dev;
 	musb->dev.dma_mask		= &musb_dmamask;
 	musb->dev.coherent_dma_mask	= musb_dmamask;
-	musb->dev.of_node		= of_node_get(dn);
 
 	glue->musb = musb;