usb: dwc3: set 'mode' based on selected Kconfig choices

Now that machines may select dwc3's working mode (HOST only,
GADGET only or DUAL_ROLE) via Kconfig, let's set dwc3's mode
based on that, rather than fixing it to whatever hardware
says.

This way we can skip initializing Gadget/Host in case
we are using Host-only/Gadget-only mode respectively.
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -479,7 +479,12 @@ static int dwc3_probe(struct platform_device *pdev)
 		goto err1;
 	}
 
-	mode = DWC3_MODE(dwc->hwparams.hwparams0);
+	if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
+		mode = DWC3_MODE_HOST;
+	else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
+		mode = DWC3_MODE_DEVICE;
+	else
+		mode = DWC3_MODE_DRD;
 
 	switch (mode) {
 	case DWC3_MODE_DEVICE: