usb: dwc3: pci: Enable extcon driver for Intel Merrifield

Intel Merrifield provides a DR support via PMIC which has its own
extcon driver.

Add a property string to link to that driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/dwc3/dwc3-pci.c

@@ -114,6 +114,7 @@ static const struct property_entry dwc3_pci_intel_properties[] = {
 
 static const struct property_entry dwc3_pci_mrfld_properties[] = {
 	PROPERTY_ENTRY_STRING("dr_mode", "otg"),
+	PROPERTY_ENTRY_STRING("linux,extcon-name", "mrfld_bcove_pwrsrc"),
 	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
 	{}
 };