usb: dwc2: fix role switch breakage

Commit beb7e592 "staging: dwc2: add check on dwc2_core_reset
return" broke the B -> A role switching on OTG-enabled platforms.
This commit fixes it.
Reported-by: NDinh Nguyen <dinguyen@altera.com>
Tested-by: NDinh Nguyen <dinguyen@altera.com>
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc2/core.c

@@ -216,7 +216,7 @@ static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
 	int retval = 0;
 
 	if (!select_phy)
-		return -ENODEV;
+		return 0;
 
 	usbcfg = readl(hsotg->regs + GUSBCFG);